EXHIBIT 4(M)


                             AMENDED AND RESTATED

                                TRUST AGREEMENT

                                     AMONG

                          ALUMINUM COMPANY OF AMERICA
                                 AS DEPOSITOR,

                           THE CHASE MANHATTAN BANK
                             AS PROPERTY TRUSTEE,

                         CHASE MANHATTAN BANK DELAWARE
                             AS DELAWARE TRUSTEE,

                                      AND

                   THE ADMINISTRATIVE TRUSTEES NAMED HEREIN

                              DATED AS OF [DATE]

                                 ALCOA TRUST I

================================================================================

 
                               TABLE OF CONTENTS
                               


                                                                                 PAGE
                                                                                 ----
                                                                              
ARTICLE 1
     DEFINED TERMS
     SECTION 1.1.   Definitions.................................................  2

ARTICLE 2
     ESTABLISHMENT OF THE TRUST
     SECTION 2.1.   Name........................................................ 14
     SECTION 2.2.   Office of the Delaware Trustee;
                         Principal Place of Business............................ 14
     SECTION 2.3.   Organizational Expenses..................................... 15
     SECTION 2.4.   Issuance of the Preferred
                         Securities............................................. 15
     SECTION 2.5.   Subscription and Purchase of
                         Debentures; Issuance of the
                         Common Securities...................................... 15
     SECTION 2.6.   Declaration of Trust........................................ 16
     SECTION 2.7.   Authorization to Enter into
                         Certain Transactions................................... 16
     SECTION 2.8.   Assets of Trust............................................. 21
     SECTION 2.9.   Title to Trust Property..................................... 21

ARTICLE 3
     PAYMENT ACCOUNT
     SECTION 3.1.   Payment account............................................. 22

ARTICLE 4
     DISTRIBUTIONS; REDEMPTION; EXCHANGE; CONVERSION
     SECTION 4.1.   Distributions............................................... 22
     SECTION 4.2.   Redemption.................................................. 23
     SECTION 4.3.   Conversion.................................................. 26
     SECTION 4.4.   Special Event Exchange or
                         Redemption............................................. 29
     SECTION 4.5.   Subordination of Common
                         Securities............................................. 32
     SECTION 4.6.   Payment Procedures.......................................... 32
     SECTION 4.7.   Tax Returns and Reports..................................... 32
     SECTION 4.8.   Payment of Taxes, Duties, Etc.,
                         of the Trust........................................... 33
     SECTION 4.9.   Payments under Indenture.................................... 33


ARTICLE 5
     TRUST SECURITIES CERTIFICATES
     SECTION 5.1.   Initial Ownership........................................... 33
     SECTION 5.2.   The Trust Securities Certificates........................... 33
     SECTION 5.3.   Delivery of Trust Securities
                         Certificates........................................... 34
 

                                       i

 

 
                                                                                   Page
                                                                                   ----
                                                                                
     SECTION 5.4.   Registration of Transfer and
                         Exchange of Preferred
                         Securities; Restrictions on
                         Transfer................................................. 35
     SECTION 5.5.   Mutilated, Destroyed, Lost or
                         Stolen Trust Securities
                         Certificates............................................. 36
     SECTION 5.6.   Persons Deemed Securityholders................................ 36
     SECTION 5.7.   Access to List of Securityholders'
                         Names and Addresses...................................... 36
     SECTION 5.8.   Maintenance of Office or Agency............................... 37
     SECTION 5.9.   Appointment of Paying Agent................................... 37
     SECTION 5.10.  Ownership of Common Securities by
                         Depositor................................................ 38
     SECTION 5.11.  Global Securities; Non-Global
                         Securities; Common Securities
                         Certificate.............................................. 38
     SECTION 5.12.  Notices to Clearing Agency.................................... 40
     SECTION 5.13.  Definitive Preferred Securities
                         Certificates............................................. 40
     SECTION 5.14.  Rights of Securityholders..................................... 41


ARTICLE 6
     ACT OF SECURITYHOLDERS; MEETINGS; VOTING..................................... 42
     SECTION 6.1.   Limitations on Voting Rights.................................. 45
     SECTION 6.2.   Notice of Meetings
     SECTION 6.3.   Meetings of Preferred......................................... 45
                         Securityholders.......................................... 45
     SECTION 6.4.   Voting Rights................................................. 46
     SECTION 6.5.   Proxies, Etc
     SECTION 6.6.   Securityholder Action by Written.............................. 46
                         Consent
     SECTION 6.7.   Record Date for Voting and Other.............................. 46
                         Purposes................................................. 47
     SECTION 6.8.   Acts of Securityholders....................................... 48
     SECTION 6.9.   Inspection of Records

ARTICLE 7
     REPRESENTATIONS AND WARRANTIES
     SECTION 7.1.   Representations and Warranties of
                         the Property Trustee and the............................. 49
                         Delaware Trustee
     SECTION 7.2.   Representations and Warranties of
                         Depositor................................................ 50


                                      ii

 

 
                                                                                  Page
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ARTICLE 8
     THE TRUSTEES
     SECTION 8.1.   Certain Duties and
                         Responsibilities.......................................    51
     SECTION 8.2.   Notice of Defaults..........................................    54
     SECTION 8.3.   Certain Rights of Property Trustee..........................    56
     SECTION 8.4.   Not Responsible for Recitals or
                         Issuance of Securities.................................    59
     SECTION 8.5.   May Hold Securities.........................................    59
     SECTION 8.6.   Compensation; Indemnity, Fees...............................    60
     SECTION 8.7.   Property Trustee Required;
                         Eligibility of Trustees................................    61
     SECTION 8.8.   Conflicting Interests.......................................    61
     SECTION 8.9.   Resignation and Removal,
                         Appointment of Successor...............................    61
     SECTION 8.10.  Acceptance of Appointment by
                         Successor..............................................    64
     SECTION 8.11.  Merger, Conversion, Consolidation
                         or Succession to Business..............................    65
     SECTION 8.12.  Preferential Collection of Claims
                         Against Depositor or Trust.............................    65
     SECTION 8.13.  Reports by Property Trustee.................................    65
     SECTION 8.14.  Reports to the Property Trustee.............................    65
     SECTION 8.15.  Evidence of Compliance with
                         Conditions Precedent...................................    65
     SECTION 8.16.  Number of Trustees..........................................    66
     SECTION 8.17.  Delegation of Power.........................................    66

ARTICLE 9
     DISSOLUTION, LIQUIDATION AND MERGER
     SECTION 9.1.   Dissolution upon Expiration Date............................    67
     SECTION 9.2.   Early Dissolution...........................................    67
     SECTION 9.3.   Dissolution.................................................    67
     SECTION 9.4.   Liquidation.................................................    68
     SECTION 9.5.   Mergers, Consolidations,
                         Amalgamations or Replacements
                         of the Trust...........................................    69

ARTICLE 10
     MISCELLANEOUS PROVISIONS
     SECTION 10.1.  Limitation of Rights of
                         Securityholders........................................    71
     SECTION 10.2.  Amendment...................................................    71
     SECTION 10.3.  Separability................................................    73
     SECTION 10.4.  Governing Law...............................................    73
     SECTION 10.5.  Payments Due on Non-Business Day............................    73
     SECTION 10.6.  Successors..................................................    74
     SECTION 10.7.  Headings....................................................    74


                                      iii

 

 
                                                                                  Page
                                                                                  ----
                                                                              
     SECTION 10.8.  Reports, Notices and Demands................................    74
     SECTION 10.9.  Agreement Not to Petition...................................    74
     SECTION 10.10. Trust Indenture Act; Conflict with
                         Trust Indenture Act....................................    75
     SECTION 10.11. Acceptance of Terms of Trust
                         Agreement, Guarantee and
                         Indenture..............................................    75
     SECTION 10.12. Counterparts................................................    76
 

EXHIBIT A - Certificate of Trust of Alcoa Trust I

EXHIBIT B - Form of Certificate Depositary Agreement

EXHIBIT C - Form of Common Securities of Alcoa Trust I

EXHIBIT D - Form of Preferred Securities of Alcoa Trust I

EXHIBIT E - Notice of Conversion

                                      iv

 
                                ALCOA TRUST I*

                   Certain Sections of this Trust Agreement
                     relating to Sections 310 through 318
                      of the Trust Indenture Act of 1939:



TRUST INDENTURE                                                       TRUST AGREEMENT
ACT SECTION                                                           SECTION
                                                                   
Section 310        (a)(1)      .............................          8.7
                   (a)(2)      .............................          8.7
                   (a)(3)      .............................          Not Applicable
                   (a)(4)      .............................          2.7(a)(ii)
                   (b)         .............................          8.8
Section 311        (a)         .............................          8.12
                   (b          .............................          8.12
Section 312        (a)         .............................          5.7
                   (b)         .............................          5.7
                   (c)         .............................          5.7
Section 313        (a)         .............................          8.13(a)
                   (c)         .............................          10.8
                   (d)         .............................          8.13(c)
                   (a)(4)      .............................          8.13(b)
                   (b)         .............................          8.13(b)
Section 314        (a)         .............................          8.14
                   (b)         .............................          Not Applicable
                   (c)(1)      .............................          8.15
                   (c)(2)      .............................          8.15
                   (c)(3)      .............................          Not Applicable
                   (d)         .............................          Not Applicable
                   (e)         .............................          1.1, 8.15
Section 315        (a)         .............................          8.1(a), 8.3(a)
                   (b)         .............................          8.2, 10.8
                   (c)         .............................          8.1(a)
                   (d)         .............................          8.1, 8.3
                   (e)         .............................          Not Applicable
Section 316        (a)         .............................          Not Applicable
                   (a)(1)(A)   .............................          Not Applicable
                   (a)(1)(B)   .............................          Not Applicable
                   (a)(2)      .............................          Not Applicable
                   (b)         .............................          Not Applicable
                   (c)         .............................          6.7
Section 317        (a)(1)      .............................          Not Applicable
                   (b)         .............................          5.9
Section 318        (a)         .............................          10.10


____________________

Note:  This reconciliation and tie sheet shall not, for any purpose, be deemed
to be a part of the Trust Agreement.

                                       v

 
          AMENDED AND RESTATED TRUST AGREEMENT, dated as of [             ]
among (i) Aluminum Company of America, a Pennsylvania corporation, (including
any successors or assigns, the "Depositor'), (ii) The Chase Manhattan Bank, a
New York banking corporation, as property trustee (in such capacity, the
"Property Trustee" and, in its personal capacity and not in its capacity as
Property Trustee, the "Bank"), (iii) Chase Manhattan Bank Delaware, a
corporation duly organized and existing under the laws of the State of Delaware,
as Delaware trustee (in such capacity, the "Delaware Trustee"), (iv) [AT], an
individual, [AT], an individual, and [AT], an individual, each of whose address
is c/o Aluminum Company of America, 201 Isabella Street, Pittsburgh, PA  15212-
5858, each, an "Administrative Trustee" and, collectively, the "Administrative
Trustees" and, collectively with the Property Trustee and Delaware Trustee, the
"Trustees") and (iv) the several Holders as hereinafter defined.


                             W I T N E S S E T H:

          WHEREAS, the Depositor and certain of the Trustees have heretofore
duly declared and created a business trust pursuant to the Delaware Business
Trust Act by the entering into of that certain Declaration of Trust, dated as of
[                ] (the "Original Trust Agreement"), and by the execution and
filing by certain of the Trustees with the Secretary of State of the State of
Delaware of the Certificate of Trust, filed on [              ], attached as
Exhibit A, for the sole purpose of issuing and selling certain securities
representing undivided beneficial interests in the assets of the Trust (as
defined herein) and investing the proceeds thereof in the Debentures (as defined
herein); and

          WHEREAS, the parties hereto desire to amend and restate the Original
Trust Agreement in its entirety as set forth herein to provide for, among other
things, (i) the issuance and sale of the Common Securities (as defined herein)
by the Trust to the Depositor, (ii) the issuance and sale of the Preferred
Securities (as defined herein) by the Trust pursuant to the Underwriting
Agreement (as defined herein) and (iii) the acquisition by the Trust from the
Depositor of all of the right, title and interest in the Debentures;

          NOW, THEREFORE, in consideration of the agreements and obligations set
forth herein and for other good and valuable consideration, the sufficiency of
which is hereby

 
acknowledged, each party, for the benefit of the other parties and for the
benefit of the Holders of the Preferred Securities, hereby amends and restates
the Original Trust Agreement in its entirety and agrees as follows:


                                   ARTICLE 1
                                 DEFINED TERMS

          SECTION 1.1.  Definitions.  For all purposes of this Trust Agreement,
                        ------------                                           
except as otherwise expressly provided or unless the context otherwise requires:

          (a)  the terms defined in this Article have the meanings assigned to
them in this Article and include the plural as well as the singular;

          (b) all other terms used herein that are defined in the Trust
Indenture Act, either directly or by reference therein, have the meanings
assigned to them therein;

          (c) unless the context otherwise requires, any reference to an
"Article" or a "Section" refers to an Article or a Section, as the case may be,
of this Trust Agreement; and

          (d) the words "herein", "hereof" and "hereunder" and other words of
similar import refer to this Trust Agreement as a whole and not to any
particular Article, Section or other subdivision.

          "Act" has the meaning specified in Section 6.8.

          ["Additional Amount" means, with respect to the Trust Securities, the
amount of Additional Interest (as defined in the Indenture) paid by the
Depositor on the Debentures.]

          ["Additional Sums" means, with respect to the Trust Securities, the
amount of Additional Sums (as defined in the Indenture) paid by the Depositor on
the Debentures.]

          "Administrative Trustee" means each of [           ,         and
  ], each solely in his capacity as Administrative Trustee of the Trust and not
in his individual capacity, or such Administrative Trustee's successor in
interest in such capacity, or any successor in interest in such capacity, or any
successor administrative trustee appointed as herein provided.

                                       2

 
          "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person, provided, however that an Affiliate of the
Depositor shall be deemed not to include the Trust.  For the purposes of this
definition, "control" when used with respect to any specified Person means the
power to direct the management and policies of such Person, directly or
indirectly, whether through the ownership of voting securities, by contract or
otherwise; and the terms "controlling" and "controlled" have meanings
correlative to the foregoing.

          ["Applicable Procedures" means, with respect to any transfer or
transaction involving a Global Certificate or beneficial interest therein, the
rules and procedures of Euroclear and Cedel, and of the Clearing Agency for such
security, in each case to the extent applicable to such transaction and as in
effect from time to time.]

          "Bank" has the meaning specified in the preamble to this Trust
Agreement.

          "Bankruptcy Event" means, with respect to any Person:

          (a)  the entry of a decree or order by a court having jurisdiction in
     the premises judging such Person as bankrupt or insolvent, or approving as
     properly filed a petition seeking reorganization, arrangement, adjudication
     or composition of or in respect of such Person under any applicable Federal
     or State bankruptcy, insolvency, reorganization or other similar law, or
     appointing a receiver, liquidator, assignee, trustee, sequestrator (or
     other similar official) of such Person or of substantially all of its
     property or ordering the winding-up or liquidation of its affairs, and the
     continuance of any such decree or order unstayed and in effect for a period
     of 60 consecutive days; or

          (b)  the institution by such Person of proceedings to be adjudicated
     as bankrupt or insolvent, or the consent by it to the institution of
     bankruptcy or insolvency proceedings against it, or the filing by it of a
     petition or answer or consent seeking reorganization or relief under any
     applicable Federal or State bankruptcy, insolvency, reorganization or other
     similar law, or the consent by it to the filing of any such petition or to
     the appointment of a receiver, liquidator, assignee, trustee, sequestrator

                                       3

 
     (or similar official) of such Person or of substantially all of its
     property, or the making by it of an assignment for the benefit of
     creditors, or the admission by it in writing of its inability to pay its
     debts generally as they become due and its willingness to be adjudicated a
     bankrupt, or the taking of corporate action by such Person in furtherance
     of any such action.

          "Bankruptcy Laws" has the meaning specified in Section 10.9.

          "Board of Directors" means either the board of directors of the
Depositor or any committee of that board duly authorized to act hereunder.

          "Book-Entry Preferred Securities Certificates" means a beneficial
interest in the Preferred Securities Certificates, ownership and transfers of
which shall be made through book entries by a Clearing Agency as described in
Section 5.11.

          "Business Day" means any day other than a Saturday or Sunday or a day
on which banking institutions in The City of New York are authorized or required
by law or executive order to remain closed or a day on which the Corporate Trust
Office of the Property Trustee or the corporate trust office of the Debenture
Trustee, is closed for business.

          "Certificate Depository Agreement" means the agreement among the
Trust, the Depositor and The Depository Trust Company, as the initial Clearing
Agency, dated as of the Closing Date, relating to the Trust Securities
Certificates substantially in the form attached as Exhibit B, as the same may be
amended and supplemented from time to time.

          "Clearing Agency" means an organization registered as a "clearing
agency" pursuant to Section 17A of the Securities Exchange Act of 1934, as
amended.  The Depository Trust Company will be the initial Clearing Agency.

          "Clearing Agency Participant" means a broker, dealer, bank, other
financial institution or other Person for whom from time to time a Clearing
Agency effects book-entry transfers and pledges of securities deposited with the
Clearing Agency.

          "Closing Date" means the first Time of Delivery (as defined in the
Underwriting Agreement), which date is

                                       4

 
also the date of execution and delivery of this Trust Agreement.

          "Commission" means the Securities and Exchange Commission, as from
time to time constituted, created under the Securities Exchange Act of 1934, as
amended, or, if at any time after the execution of this instrument such
Commission is not existing and performing the duties now assigned to it under
the Trust Indenture Act, then the body performing such duties at such time.

          "Common Securities Certificate" means a certificate evidencing
ownership of Common Securities, substantially in the form attached as Exhibit C.

          "Common Security" means an undivided beneficial interest in the assets
of the Trust, having a Liquidation Amount with respect to the assets of the
Trust of $50 and having the rights provided therefor in this Trust Agreement,
including the right to receive Distributions and a Liquidation Distribution as
provided herein.

          "Common Stock" means common stock, $1.00 par value per share, of the
Depositor.

          "Conversion Agent" has the meaning specified in Section 4.3.

          "Conversion Date" has the meaning specified in Section 4.3.

          "Conversion Price" has the meaning specified in Section 4.3.

          "Corporate Trust Office" means the principal corporate trust office of
the Property Trustee at which at any particular time its corporate trust
business shall be administered, which office at the date hereof is located at
450 West 33rd Street, New York, New York 10001  Attention: Global Trust
Services.

          "Current Market Price", with respect to Common Stock, means for any
day the last reported sale price, regular way, on such day, or, if no sale takes
place on such day, the average of the reported closing bid and asked prices on
such day, regular way, in either case as reported on the New York Stock Exchange
Composite Transactions Tape, or, if Common Stock is not listed or admitted to
trading on the New York Stock Exchange on such day, on the principal national
securities exchange on which Common Stock is listed or admitted to trading, if
Common Stock is listed on a

                                       5

 
national securities exchange, or the Nasdaq National Market, or, if Common Stock
is not quoted or admitted to trading on such quotation system, on the principal
quotation system on which Common Stock may be listed or admitted to trading or
quoted, or, if not listed or admitted to trading or quoted on any national
securities exchange or quotation system, the average of the closing bid and
asked prices of Common Stock in the over-the-counter market on the day in
question as reported by the National Quotation Bureau Incorporated, or a similar
generally accepted reporting service, or, if not so available in such manner, as
furnished by any New York Stock Exchange member firm selected from time to time
by the Board of Directors for that purpose or, if not so available in such
manner, as otherwise determined in good faith by the Board of Directors.

          "Debenture Event of Default" means an "Event of Default" as defined in
the Indenture.

          "Debenture Redemption Date" means, with respect to any Debentures to
be redeemed under the Indenture, the date fixed for redemption thereof under the
Indenture.

          "Debenture Trustee" means [T], a [          ] banking corporation, as
trustee under the Indenture.

          "Debentures" means all of the Depositor's [     ] [junior] convertible
subordinated debentures, $[           ] aggregate principal amount, issued
pursuant to the Indenture.

          "Definitive Preferred Securities Certificates" means either or both
(as the context requires) of (x) Preferred Securities Certificates issued in
certificated, fully registered form as provided in Section 5.11(b) and (y)
Preferred Securities Certificates issued in certificated, fully registered form
as provided in Section 5.13.

          "Delaware Business Trust Act" means Chapter 38 of Title 12 of the
Delaware Code, 12 Del. C. ((S)) 3801, et seq., as it may be amended from time to
time.

          "Delaware Trustee" means the Person identified as the "Delaware
Trustee" in the preamble to this Trust Agreement solely in its capacity as
Delaware Trustee of the Trust and not in its individual capacity, or its
successor in interest in such capacity, or any successor Delaware trustee
appointed as herein provided.

                                       6

 
          "Depositor" has the meaning specified in the preamble to this Trust
Agreement.

          "Direct Action" has the meaning specified in Section 6.8.

          "Distribution Date" has the meaning specified in Section 4.1(a).

          "Distributions" means amounts payable in respect of the Trust
Securities as provided in Section 4.1.

          "Early Dissolution Event" has the meaning specified in Section 9.2.

          "Event of Default" means the occurrence of a Debenture Event of
Default, whatever the reason for such Debenture Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation
of any administrative or governmental body.

          "Exchange Notice" has the meaning specified in Section 4.4(b).

          "Expiration Date" has the meaning specified in Section 9.1.

          "Global Certificate" means a Preferred Security that is registered in
the Securities Register in the name of a Clearing Agency or a nominee thereof.

          "Guarantee" means the Guarantee Agreement executed and delivered by
the Depositor and The Chase Manhattan Bank, a New York banking corporation, as
guarantee trustee, contemporaneously with the execution and delivery of this
Trust Agreement, for the benefit of the Holders of the Preferred Securities, as
amended from time to time.

          "Holder" means a Person in whose name a Trust Securities Certificate
representing a Trust Security is registered, such Person being a beneficial
owner within the meaning of the Delaware Business Trust Act.

          "Indenture" means the Junior Convertible Subordinated Indenture, dated
as of [           , 1998] between the Depositor and the Debenture Trustee, as
amended or supplemented from time to time.

                                       7

 
          "Investment Company Event" means the receipt by the Property Trustee,
on behalf of the Trust, of an Opinion of Counsel, rendered by a law firm having
a national tax and securities practice (which Opinion of Counsel shall not have
been rescinded by such law firm), to the effect that, as a result of the
occurrence of a change in law or regulation or a change in interpretation or
application of law or regulation by any legislative body, court, governmental
agency or regulatory authority (a "Change in 1940 Act Law"), there is more than
an insubstantial risk that the Trust is or will be considered an "investment
company" that is required to be registered under the 1940 Act, which Change in
1940 Act Law becomes effective on or after the date of original issuance of the
Preferred Securities under this Trust Agreement.

          "Lien" means any lien, pledge, charge, encumbrance, mortgage, deed of
trust, adverse ownership interest, hypothecation, assignment, security interest
or preference, priority or other security agreement or preferential arrangement
of any kind or nature whatsoever.

          "Liquidation Amount" means an amount with respect to the assets of the
Trust equal to $50 per Trust Security.

          "Liquidation Date" means each date on which Debentures or cash are to
be distributed to Holders of Trust Securities in connection with a dissolution
and liquidation of the Trust pursuant to Section 9.4(a).

          "Liquidation Distribution" has the meaning specified in Section
9.4(d).

          "1940 Act" means the Investment Company Act of 1940, as amended.

          "Notice of Conversion" means the notice given by a Holder of Preferred
Securities to the Conversion Agent directing the Conversion Agent to exchange
such Preferred Securities for Debentures and to convert such Debentures into
Common Stock on behalf of such holder.  Such notice is substantially in the form
set forth in Exhibit E.

          "Officers' Certificate" means a certificate signed by (i) the Chairman
of the Board, Vice Chairman of the Board, the President or a Vice President, and
by (ii) the Treasurer, an Assistant Treasurer, the Secretary or an Assistant
Secretary, the Controller, or an Assistant Controller, of the Depositor, and
delivered to the Trustee. One of the officers signing an Officers' Certificate
given pursuant to Section 8.15 shall be the principal executive,

                                       8

 
financial or accounting officer of the Depositor.  Any Officers' Certificate
delivered with respect to compliance with a condition or covenant provided for
in this Trust Agreement shall include:

          (a)  a statement that each officer signing the Officers' Certificate
     has read the covenant or condition and the definitions relating thereto;

          (b)  a brief statement of the nature and scope of the examination or
     investigation undertaken by each officer in rendering the Officers'
     Certificate;

          (c)  a statement that each officer has made such examination or
     investigation as, in such officer's opinion, is necessary to enable such
     officer to express an informed opinion as to whether or not such covenant
     or condition has been complied with; and

          (d)  a statement as to whether, in the opinion of each such officer,
     such condition or covenant has been complied with.

          "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for the Trust, the Property Trustee or the Depositor, and who may be an
employee of any thereof, and who shall be reasonably acceptable to the Property
Trustee.  Any Opinion of Counsel delivered with respect to compliance with a
condition or covenant provided for in this Trust Agreement shall include:

          (a)  a statement that the counsel signing the Opinion of Counsel has
     read the covenant or condition and the definitions relating thereto;

          (b)  a brief statement of the nature and scope of the examination or
     investigation undertaken by such counsel in rendering the Opinion of
     Counsel;

          (c)  a statement that such counsel has made such examination or
     investigation as is necessary to enable such counsel to express an informed
     opinion as to whether or not such covenant or condition has been complied
     with; and

          (d)  a statement as to whether, in the opinion of each such counsel,
     such condition or covenant has been complied with.

          "Optional Redemption Price" means with respect to the Preferred
Securities (except as set forth below with

                                       9

 
respect to redemption upon the occurrence of a Tax Event), the following
percentages of the Liquidation Amounts thereof, plus accumulated and unpaid
Distributions, if any, to the date fixed for redemption if redeemed during the
twelve-month period commencing [          ] in each of the following years
indicated:



Year      Redemption Price          Year        Redemption Price   
- ----      ----------------          ----        ----------------  
                                        
[    ]       [     ]%              [     ]         [        ]%  
                                                                
[    ]       [     ]%              [     ]         [        ]%  
                                                                
[    ]       [     ]%             [     ] and      [        ]%  
                                  thereafter                    

[    ]       [     ]%
 

          In the event of a redemption of Trust Securities upon the occurrence
of a Tax Event, Trust Securities shall be redeemed at the redemption price of
$50 per Trust Security and all accumulated and unpaid Distributions, if any, to
the date fixed for redemption.

          "Original Trust Agreement" has the meaning specified in the recitals
to this Trust Agreement.

          "Outstanding", when used with respect to Trust Securities, means, as
of the date of determination, all Trust Securities theretofore executed and
delivered under this Trust Agreement, except:

          (a)  Trust Securities theretofore cancelled by the Securities
     Registrar or delivered to the Securities Registrar for cancellation or
     tendered for conversion;

          (b)  Trust Securities for whose payment or redemption money in the
     necessary amount has been theretofore deposited with the Property Trustee
     or any Paying Agent for the Holders of such Trust Securities; provided
     that, if such Trust Securities are to be redeemed, notice of such
     redemption has been duly given pursuant to this Trust Agreement;

          (c)  Trust Securities which have been exchanged for Debentures
     pursuant to Section 4.4; and

          (d)  Trust Securities which have been paid or in exchange for or in
     lieu of which other Trust Securities have been executed and delivered
     pursuant to Section 5.5;

                                      10

 
provided, however, that in determining whether the Holders of the requisite
- --------  -------                                                          
Liquidation Amount of the Outstanding Trust Securities have given any request,
demand, authorization, direction, notice, consent or waiver hereunder, Trust
Securities owned by the Depositor, any Trustee or any Affiliate of the Depositor
or any Trustee shall be disregarded and deemed not to be Outstanding, except
that (a) in determining whether any Trustee shall be fully protected in relying
upon any such request, demand, authorization, direction, notice, consent or
waiver, only Trust Securities that a Responsible Officer of the Property Trustee
or the Delaware Trustee, or an individual Administrative Trustee, as the case
may be, actually knows to be so owned shall be so disregarded and (b) the
foregoing shall not apply at any time when all of the Outstanding Trust
Securities are owned by the Depositor, one or more of the Administrative
Trustees and/or any such Affiliate. Trust Securities so owned which have been
pledged in good faith may be regarded as Outstanding if the pledgee establishes
to the satisfaction of the Securities Registrar the pledgee's right so to act
with respect to such Trust Securities and that the pledgee is not the Depositor
or any Affiliate of the Depositor.

          "Owner" means each Person who is the beneficial owner of a Book-Entry
Preferred Securities Certificate as reflected in the records of the Clearing
Agency or, if a Clearing Agency Participant is not the Owner, then as reflected
in the records of a Person maintaining an account with such Clearing Agency
(directly or indirectly, in accordance with the rules of such Clearing Agency).

          "Paying Agent" means any paying agent or co-paying agent appointed
pursuant to Section 5.9.

          "Payment Account" means a segregated non-interest bearing corporate
trust account maintained by the Property Trustee with the Bank in its trust
department for the benefit of the Securityholders in which all amounts paid in
respect of the Debentures will be held and from which the Property Trustee shall
make payments to the Securityholders in accordance with Section 4.1.

          "Person" means any individual, corporation, partnership, joint
venture, association, joint stock company, trust, limited liability company or
corporation, unincorporated organization or government or any agency or
political subdivision thereof.

                                      11

 
          "Preferred Securities Certificate" means a certificate evidencing
ownership of Preferred Securities, substantially in the form attached as Exhibit
D.

          "Preferred Security" means an undivided beneficial interest in the
assets of the Trust, having a Liquidation Amount with respect to the assets of
the Trust of $50 and having the rights provided therefor in this Trust
Agreement, including the right to receive Distributions and a Liquidation
Distribution as provided herein.

          "Property Trustee" means the commercial bank or trust company
identified as the "Property Trustee" in the preamble to this Trust Agreement
solely in its capacity as Property Trustee of the Trust and not in its
individual capacity, or its successor in interest in such capacity, or any
successor property trustee appointed as herein provided.

          "Redemption Date" means, with respect to any Trust Security to be
redeemed, each Debenture Redemption Date.

          "Redemption Price" means, with respect to any Trust Security, $50 per
Trust Security, plus accumulated and unpaid Distributions (including any
Additional Sums) to the date of redemption.

          "Relevant Trustee" has the meaning specified in Section 8.9.

          "Responsible Officer" means, with respect to the Property Trustee or
the Delaware Trustee, any officer, including any managing director, vice
president, assistant vice president, assistant treasurer, assistant secretary or
any other officer of the Property Trustee or the Delaware Trustee, as the case
may be, customarily performing functions similar to those performed by any of
the above designated officers and having direct responsibility for the
administration of this Trust Agreement, and also, with respect to a particular
matter, any other officer, to whom such matter is referred because of such
officer's knowledge of and familiarity with the particular subject.

          "Securities Register" and "Securities Registrar" have the respective
meanings specified in Section 5.4.

          "Securityholder" or "Holder" means a Person in whose name a Trust
Security or Securities is registered in the Securities Register; any such Person
shall be deemed to be a beneficial owner within the meaning of the Delaware
Business Trust Act.

                                      12

 
          "Special Event" means a Tax Event or an Investment Company Event.

          "Successor Property Trustee" has the meaning specified in Section 8.9.

          "Successor Delaware Trustee" has the meaning specified in Section 8.9.

          "Successor Securities" has the meaning specified in Section 9.5.

          "Super Majority" has the meaning specified in Section 8.2.

          "Tax Event" means the receipt by the Property Trustee, on behalf of
the Trust, of an Opinion of Counsel, rendered by a law firm having a national
tax and securities practice (which Opinion of Counsel shall not have been
rescinded by such law firm), to the effect that, as a result of any amendment
to, or change (including any announced prospective change) in, the laws (or any
regulations thereunder) of the United States or any political subdivision or
taxing authority thereof or therein affecting taxation, or as a result of any
official administrative pronouncement or judicial decision interpreting or
applying such laws or regulations, which amendment or change is effective or
such pronouncement or decision is announced on or after the date of issuance of
the Preferred Securities under this Trust Agreement and does not pertain to the
use of the proceeds of the issuance of the Debentures, there is more than an
insubstantial risk in each case after the date thereof that (i) the Trust is, or
will be within 90 days after the date thereof, subject to United State Federal
income tax with respect to income received or accrued on the Debentures, (ii)
interest payable by the Depositor on the Debentures is not, or will not be,
within 90 days after the date thereof, deductible, in whole or in part, for
United States Federal income tax purposes or (iii) the Trust is, or will be
within 90 days after the date thereof, subject to more than de minimus amount of
                                                            -- -------          
other taxes, duties, assessments or other governmental charges.

          "Trust" means the Delaware business trust continued hereby and
identified on the cover page of this Trust Agreement.

          "Trust Agreement" means this Amended and Restated Trust Agreement, as
the same may be modified, amended or supplemented in accordance with the
applicable provisions hereof, including all exhibits hereto, including, for all

                                      13

 
purposes of this Trust Agreement any such modification, amendment or supplement,
the provisions of the Trust Indenture Act that are deemed to be a part of and
govern this Trust Agreement and any such modification, amendment or supplement,
respectively.

          "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this instrument was executed; provided, however,
                                                            --------  ------- 
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

          "Trust Property" means (a) the Debentures, (b) any cash on deposit in,
or owing to, the Payment Account and (c) all proceeds and rights in respect of
the foregoing to be held by the Property Trustee pursuant to the terms of this
Trust Agreement for the benefit of the Securityholders.

          "Trust Security" means any one of the Common Securities or the
Preferred Securities.

          "Trust Securities Certificate" means any one of the Common Securities
Certificates, the Global Certificates or the Definitive Preferred Securities
Certificates.

          "Trustees" means, collectively, the Property Trustee, the Delaware
Trustee and the Administrative Trustees.

          "Underwriting Agreement" means the Underwriting Agreement, dated as of
[                 ], including the Pricing Agreement dated [           ], among
the Trust, the Depositor and the Underwriters named therein.


                                   ARTICLE 2
                          ESTABLISHMENT OF THE TRUST

          SECTION 2.1.  Name.  The Trust continued hereby shall be known as
                        ----                                               
"Alcoa Trust [  ], as such name may be modified from time to time by the
Administrative Trustees following written notice to the Holders of Trust
Securities and the other Trustees, in which name the Trustees may conduct the
business of the Trust, make and execute contracts and other instruments on
behalf of the Trust and sue and be sued.

          SECTION 2.2.  Office of the Delaware Trustee; Principal Place of
                        --------------------------------------------------
Business.  The address of the Delaware
- ---------                             

                                      14

 
Trustee in the State of Delaware is 1201 Market Street, Wilmington, Delaware
19801, Attention:  Corporate Trust Department, or such other address in the
State of Delaware as the Delaware Trustee may designate by written notice to the
Securityholders and the Depositor.  The principal executive office of the Trust
is 201 Isabella Street, Pittsburgh, PA  15212-5858.

          SECTION 2.3.  Organizational Expenses.  The Depositor shall pay
                        ------------------------                         
organizational expenses of the Trust as they arise or shall, upon request of any
Trustee, promptly reimburse such Trustee for any such expenses paid by such
Trustee.  The Depositor shall make no claim upon the Trust Property for the
payment of such expenses.

          SECTION 2.4.  Issuance of the Preferred Securities.  On [         ],
                        ------------------------------------- 
the Depositor on behalf of the Trust executed and delivered the Underwriting
Agreement. Contemporaneously with the execution and delivery of this Trust
Agreement, an Administrative Trustee, on behalf of the Trust, shall execute in
accordance with Section 5.2 and deliver to the Underwriters named in the
Underwriting Agreement Preferred Securities Certificates, in an aggregate amount
of [          ] Preferred Securities having an aggregate Liquidation Amount of
$[              ], against receipt of the aggregate purchase price of such
Preferred Securities of $[           ], which amount the Administrative Trustees
shall promptly deliver, or cause to be delivered, to the Property Trustee.

          SECTION 2.5.  Subscription and Purchase of Debentures; Issuance of the
                        --------------------------------------------------------
Common Securities. Contemporaneously with the execution and delivery of this
- ------------------                                                          
Trust Agreement, the Administrative Trustees, on behalf of the Trust, shall
subscribe to and purchase from the Depositor Debentures, registered in the name
of the Property Trustee (in its capacity as such) and having an aggregate
principal amount equal to $[           ], and, in satisfaction of the purchase
price for such Debentures, the Property Trustee, on behalf of the Trust, shall
deliver to the Depositor the sum of $[            ].  Contemporaneously
therewith, an Administrative Trustee, on behalf of the Trust, shall execute in
accordance with Section 5.2 and deliver to the Depositor Common Securities
Certificates registered in the name of the Depositor, in an aggregate amount of
[       ] Common Securities having an aggregate Liquidation Amount of $[      ]
against receipt by the Property Trustee of the aggregate purchase price of
such Common Securities from the Depositor of the sum of $[          ].

                                      15

 
          SECTION 2.6.  Declaration of Trust.  The exclusive purposes and
                        ---------------------                            
functions of the Trust are (a) to issue and sell Trust Securities and use the
proceeds from such sale to acquire the Debentures, (b) to distribute the Trust's
income as provided in this Trust Agreement and (c) to engage in only those other
activities necessary or incidental thereto. The Trust shall not borrow money,
issue debt or reinvest proceeds derived from investments, mortgage or pledge any
of its assets or otherwise undertake (or permit to be undertaken) any activity
that would cause the Trust not to be classified for United States Federal income
tax purposes as a grantor trust.  The Depositor hereby appoints the Trustees as
trustees of the Trust, to have all the rights, powers and duties to the extent
set forth herein, and the Trustees hereby accept such appointment, subject to
the terms and conditions hereof.  The Property Trustee hereby declares that it
will hold the Trust Property in trust upon and subject to the conditions set
forth herein for the benefit of the Trust and the Securityholders.  The
Administrative Trustees shall have all rights, powers and duties set forth
herein and in accordance with applicable law with respect to accomplishing the
purposes of the Trust. The Delaware Trustee shall not be entitled to exercise
any powers, nor shall the Delaware Trustee have any of the duties and
responsibilities, of the Property Trustee or the Administrative Trustees set
forth herein.  The Delaware Trustee shall be one of the Trustees of the Trust
for the sole and limited purpose of fulfilling the requirements of Section 3807
of the Delaware Business Trust Act.  In the event the Delaware Trustee shall at
any time be required to take any action or perform any duty hereunder, the
Delaware Trustee shall be entitled to the benefits of Section 8.1(c) and Section
8.3.  No implied covenants or obligations shall be read into this Trust
Agreement against the Delaware Trustee.

          SECTION 2.7.  Authorization to Enter into Certain Transactions.  (a)
                        -------------------------------------------------      
The Trustees shall conduct the affairs of the Trust in accordance with the terms
of this Trust Agreement.  Subject to the limitations set forth in Section 2.6
and paragraph (b) of this Section, and in accordance with the following
provisions (i) and (ii), the Trustees shall have the exclusive power, duty and
the authority to cause the Trust to engage in the following activities:

          (i)  As among the Trustees, each Administrative Trustee shall have the
     exclusive power and authority to

                                      16

 
     act on behalf of the Trust with respect to the following matters:

               (A)  to issue and sell the Trust Securities, provided, however,
                                                            --------  ------- 
          that the Trust may issue no more than one series of Preferred
          Securities and no more than one series of Common Securities, and,
          provided, further, that there shall be no interests in the Trust other
          than the Trust Securities, and the issuance of Trust Securities shall
          be limited to simultaneous issuance of both Preferred Securities and
          Common Securities on the Closing Date and any other date Preferred
          Securities and Common Securities are sold pursuant to the over-
          allotment option granted to the Underwriters named in the Underwriting
          Agreement, subject to the issuance of Trust Securities pursuant to
          Section 5.5 and Successor Securities pursuant to Section 9.5;

               (B)  to cause the Trust to enter into, and to execute, deliver
          and perform on behalf of the Trust, the Certificate Depository
          Agreement and such other agreements as may be necessary or incidental
          to the purposes and function of the Trust;

               (C)  to assist in the registration of the Preferred Securities
          under the Securities Act of 1933, as amended, and under state
          securities or blue sky laws, and the qualification of this Trust
          Agreement as a trust indenture under the Trust Indenture Act;

               (D)  to assist in the listing of the Preferred Securities upon
          such securities exchange or exchanges, if any, as shall be determined
          by the Depositor and the registration of the Preferred Securities
          under the Securities Exchange Act of 1934, as amended, and the
          preparation and filing of all periodic and other reports and other
          documents pursuant to the foregoing (only to the extent that such
          listing or registration is requested by the Depositor);

               (E)  to appoint a Paying Agent, a Securities Registrar and an
          authenticating agent in accordance with this Trust Agreement;

               (F)  to the extent provided in this Trust Agreement, to wind up
          the affairs of and liquidate

                                      17

 
          the Trust and prepare, execute and file the certificate of
          cancellation with the Secretary of State of the State of Delaware;

               (G)  unless otherwise required by the Delaware Business Trust Act
          or the Trust Indenture Act, to execute on behalf of the Trust (either
          acting alone or together with any other Administrative Trustees) any
          documents that the Administrative Trustees have the power to execute
          pursuant to this Trust Agreement; and

               (H)  to take any action incidental to the foregoing as the
          Trustees may from time to time determine is necessary or advisable to
          give effect to the terms of this Trust Agreement including, but not
          limited to:

                    (i)   causing the Trust not to be deemed to be an Investment
               Company required to be registered under the 1940 Act;

                    (ii)  causing the Trust to be classified for United States
               Federal income tax purposes as a grantor trust; and

                    (iii) cooperating with the Depositor to ensure that the
               Debentures will be treated as indebtedness of the Depositor for
               United States Federal income tax purposes;

          provided that such action does not adversely affect in any material
          --------                                                           
          respect the interests of Securityholders except as otherwise provided
          in Section 10.2(a).

               (I)  to execute all documents or instruments, perform all duties
          and powers, and do all things for and on behalf of the Trust in all
          matters necessary or incidental to the foregoing.

          (ii) As among the Trustees, the Property Trustee shall have the
     power, duty and authority to act on behalf of the Trust with respect to the
     following matters:

               (A)  the establishment of the Payment Account;

               (B)  the receipt of and taking title to the Debentures;

                                      18

 
               (C)  the collection of interest, principal and any other payments
          made in respect of the Debentures in the Payment Account;

               (D)  the distribution from the Trust Property of amounts owed to
          the Securityholders in respect of the Trust Securities;

               (E)  the exercise of all of the rights, powers and privileges of
          a holder of the Debentures;

               (F)  the sending of notices of default, other notices and other
          information regarding the Trust Securities and the Debentures to the
          Securityholders in accordance with this Trust Agreement;

               (G)  the distribution of the Trust Property in accordance with
          the terms of this Trust Agreement;

               (H)  to the extent provided in this Trust Agreement, the winding
          up of the affairs of and liquidation of the Trust;

               (I)  after an Event of Default of which a Responsible Officer of
          the Property Trustee has knowledge, the taking of any action
          incidental to the foregoing as the Property Trustee may from time to
          time determine is necessary or advisable to give effect to the terms
          of this Trust Agreement and protect and conserve the Trust Property
          for the benefit of the Securityholders (without consideration of the
          effect of any such action on any particular Securityholder);

               (J)  subject to this Section 2.7(a)(ii), the Property Trustee
          shall have none of the duties, liabilities, powers or the authority of
          the Administrative Trustees set forth in Section 2.7(a)(i); and

               (K)  to act as Paying Agent and/or Securities Registrar to the
          extent appointed as such hereunder.

          (b)  So long as this Trust Agreement remains in effect, the Trust (or
the Trustees acting on behalf of the Trust) shall not undertake any business,
activities or transaction except as expressly provided herein or contemplated
hereby.  In particular, the Trust shall not, and the Trustees shall not and
shall not cause the Trust to

                                      19

 
(i)  invest any proceeds received by the Trust from holding the Debentures
(rather, the Trustees shall distribute all such proceeds to the Securityholders
pursuant to the terms of this Trust Agreement and the Trust Securities), acquire
any investments or engage in any activities not authorized by this Trust
Agreement, (ii) sell, assign, transfer, exchange, mortgage, pledge, set-off or
otherwise dispose of any of the Trust Property or interests therein, including
to Securityholders, except as expressly provided herein, (iii) take any action
that would cause the Trust to fail or cease to qualify as a "grantor trust" for
United States Federal income tax purposes, (iv) make any loans or incur any
indebtedness for borrowed money or issue any other debt, (v) take or consent to
any action that would result in the placement of a Lien on any of the Trust
Property, (vi) possess any power or otherwise act in such a way as to vary the
Trust assets or the terms of the Trust Securities in any way whatsoever except
as permitted by the terms of this Trust Agreement, or (vii) issue any securities
or other evidences of beneficial ownership of, or beneficial interest in, the
Trust other than the Trust Securities.  The Administrative Trustees shall defend
all claims and demands of all Persons at any time claiming any Lien on any of
the Trust Property adverse to the interest of the Trust or the Securityholders
in their capacity as Securityholders.

          (c)  In connection with the issue and sale of the Preferred
Securities, the Depositor shall have the right and responsibility to assist the
Trust with respect to, or effect on behalf of the Trust, the following actions
(and any actions taken by the Depositor in furtherance of the following prior to
the date of this Trust Agreement are hereby ratified and confirmed in all
respects):

          (i)  to file by the Trust with the Commission and to execute on behalf
     of the Trust a registration statement on the appropriate form in relation
     to the Preferred Securities, including any amendments thereto;

          (ii) to determine the States and foreign jurisdictions in which to
     take appropriate action to qualify or register for resale all or part of
     the Preferred Securities and to do any and all such acts, other than
     actions which must be taken by or on behalf of the Trust, and advise the
     Trustees of actions they must take on behalf of the Trust, and prepare for
     execution and filing any documents to be executed and filed by the Trust or
     on behalf of the Trust, as the Depositor deems necessary or advisable in
     order to comply with the applicable laws of any such States and foreign
     jurisdictions;

                                      20

 
          (iii) to the extent necessary, to prepare for filing by the Trust with
     the Commission and to execute on behalf of the Trust a registration
     statement on Form 8-A relating to the registration of the Preferred
     Securities under Section 12(b) or 12(g) of the Securities Exchange Act of
     1934, as amended, including any amendments thereto (it being understood
     that neither the Trust nor the Depositor has any obligation under the
     Indenture, the Underwriting Agreement or the Trust Agreement to register
     any Trust Securities under the Securities Exchange Act of 1934, as amended,
     or to list any Trust Securities on any securities exchange);

          (iv)  to negotiate, and to execute and deliver, on behalf of the
     Trust, the Underwriting Agreement; and

          (v)   any other actions necessary or incidental to carry out any of
     the foregoing activities.

          (d)   Notwithstanding anything herein to the contrary, the
Administrative Trustees are authorized and directed to conduct the affairs of
the Trust and to operate the Trust so that the Trust will not be deemed to be an
"investment company" required to be registered under the 1940 Act, or taxed as a
corporation for United States Federal income tax purposes and so that the
Debentures will be treated as indebtedness of the Depositor for United States
Federal income tax purposes.  In this connection, the Depositor and the
Administrative Trustees are authorized to take any action, not inconsistent with
applicable law, the Certificate of Trust or this Trust Agreement, that each of
the Depositor and the Administrative Trustees determines in their discretion to
be necessary or desirable for such purposes, so long as such action does not
adversely affect in any material respect the interests of the Holders of the
Preferred Securities except as otherwise provided in Section 10.2(a).

          SECTION 2.8.  Assets of Trust.  The assets of the Trust shall consist
                        ----------------                                       
of only the Trust Property.

          SECTION 2.9.  Title to Trust Property.  Legal title to all Trust
                        ------------------------                          
Property shall be vested at all times in the Property Trustee (in its capacity
as such) and shall be held and administered by the Property Trustee for the
benefit of the Trust and the Securityholders in accordance with this Trust
Agreement.  The Securityholders shall not have legal title to any part of the
assets of the Trust, but shall have an undivided beneficial interest in the
assets of the Trust.

                                      21

 
                                   ARTICLE 3
                                PAYMENT ACCOUNT

          SECTION 3.1.  Payment Account.  (a)  On or prior to the Closing Date,
                        ----------------                                       
the Property Trustee shall establish the Payment Account.  The Property Trustee
and any agent of the Property Trustee shall have exclusive control and sole
right of withdrawal with respect to the Payment Account for the purpose of
making deposits in and withdrawals from the Payment Account in accordance with
this Trust Agreement. All monies and other property deposited or held from time
to time in the Payment Account shall be held by the Property Trustee in the
Payment Account for the exclusive benefit of the Securityholders and for
distribution as herein provided, including (and subject to) any priority of
payments provided for herein.

          (b)  The Property Trustee shall deposit in the Payment Account,
promptly upon receipt, all payments of principal of or interest on, and any
other payments or proceeds with respect to, the Debentures.  Amounts held in the
Payment Account shall not be invested by the Property Trustee pending
distribution thereof.


                                   ARTICLE 4
                DISTRIBUTIONS; REDEMPTION; EXCHANGE; CONVERSION

          SECTION 4.1.  Distributions.  (a)  Distributions on the Trust
                        --------------                                 
Securities shall be cumulative, and shall accrue from the date of original
issuance, or the most recent Distribution Date (as defined herein) and, except
in the event that the Depositor exercises its right to defer the payment of
interest on the Debentures pursuant to the Indenture, shall be payable quarterly
in arrears on [        ], [      ], [           ] and [          ] of each year,
commencing on [             ] (which dates correspond to the interest payment
dates on the Debentures), when, as and if available for payment by the Property
Trustee, as further described in paragraph (c) of this Section 4.1.  If any date
on which Distributions are otherwise payable on the Trust Securities is not a
Business Day, then the payment of such Distributions shall be made on the next
succeeding day which is a Business Day (and no interest shall accrue for the
period from and after such date until the next succeeding Business Day) with the
same force and effect as if made on such date (each date on which Distributions
are payable in accordance with this Section 4.1(a), a "Distribution Date").

                                      22

 
          (b)  The Trust Securities represent undivided beneficial interests in
the Trust Property, and the Distributions on the Trust Securities shall be
payable at a rate of [     ]% per annum of the Liquidation Amount of the Trust
Securities, such rate being the rate of interest payable on the Debentures to be
held by the Property Trustee.  The amount of Distributions payable for any
period shall be computed on the basis of a 360-day year of twelve 30-day months.
For periods less than a full month, Distributions shall reflect interest on
Debentures computed on the basis of the actual number of elapsed days based on a
360-day year.  The amount of Distributions payable for any period shall include
the Additional Amounts, if any.

          (c)  Distributions on the Trust Securities shall be made by the
Property Trustee from the Payment Account and shall be payable on each
Distribution Date only to the extent that the Trust has funds then on hand and
available in the Payment Account for the payment of such Distributions.

          (d)  Distributions on the Trust Securities with respect to a
Distribution Date shall be payable to the Holders thereof as they appear on the
Securities Register for the Trust Securities on the relevant record date, which
shall be the date which is the fifteenth day (whether or not a Business Day)
next preceding such Distribution Date.

          SECTION 4.2.  Redemption.  (a)  Upon an optional redemption (as set
                        -----------                                          
forth in the Indenture) of Debentures, the proceeds from such redemption shall
be applied to redeem Trust Securities having an aggregate Liquidation Amount
equal to the aggregate principal amount of the Debentures so redeemed by the
Depositor, including pursuant to Section 4.4, at the Optional Redemption Price,
and upon a mandatory redemption (as set forth in the Indenture) of Debentures,
the proceeds from such redemption shall be applied to redeem Trust Securities,
having an aggregate Liquidation Amount equal to the aggregate principal amount
of the Debentures so redeemed by the Depositor, at the Redemption Price.  The
Trust may not redeem fewer than all the Outstanding Trust Securities unless all
accrued and unpaid Distributions have been paid on all Trust Securities for all
quarterly Distribution periods terminating on or prior to the date of
redemption.

          (b)  Notice of redemption (which notice will be irrevocable) shall be
given by the Property Trustee by first-class mail, postage prepaid, mailed not
less than 30 nor more than 60 days prior to the Redemption Date to the Depositor
and each Holder of Trust Securities to be

                                      23

 
redeemed, at such Holder's address as it appears in the Securities Register.
All notices of redemption shall state:

          (i)    the Redemption Date;

          (ii)   the Redemption Price or the Optional Redemption Price, as the
     case may be;

          (iii)  the record date for the determination of Holders entitled to
     receive payment of the Redemption Price or Optional Redemption Price, as
     the case may be, as provided in Section 4.2(d);

          (iv)   the CUSIP number;

          (v)    if less than all of the Outstanding Trust Securities are to be
     redeemed, the identification and the aggregate Liquidation Amount of the
     particular Trust Securities to be redeemed;

          [(vi)  the Conversion Price and that a Holder of Preferred Securities
     who desires to convert such Preferred Securities called for redemption must
     satisfy the requirements for conversion contained in Section 4.3 below;]

          (vii)  that on the Redemption Date, the Redemption Price or the
     Optional Redemption Price, as the case may be, will become due and payable
     upon each such Trust Security to be redeemed and that Distributions thereon
     will cease to accrue on and after said date; and

          (viii) the place or places where such Trust Securities are to be
     surrendered for payment of the Redemption Price or the Optional Redemption
     Price, as the case may be.

          (c)    The Trust Securities redeemed on each Redemption Date shall be
redeemed at the Redemption Price or the Optional Redemption Price, as the case
may be, with the proceeds from the contemporaneous redemption of Debentures.
Redemptions of the Trust Securities shall be made and the Redemption Price or
the Optional Redemption Price, as the case may be, shall be payable on each
Redemption Date only to the extent that the Trust has funds then on hand and
available in the Payment Account for the payment of such Redemption Price or the
Optional Redemption Price, as the case may be.

          (d)    If the Property Trustee gives a notice of redemption in respect
of any Preferred Securities, then, by

                                      24

 
12:00 noon, New York City time, on the Redemption Date, subject to Section
4.2(c), the Property Trustee will, so long as and to the extent the Preferred
Securities are in book-entry-only form, irrevocably deposit with the Clearing
Agency for the Preferred Securities funds sufficient to pay the applicable
Redemption Price. If the Preferred Securities are no longer in book-entry-only
form, the Property Trustee, subject to Section 4.2(c), will irrevocably deposit
with the Paying Agent funds sufficient to pay the applicable Redemption Price or
Optional Redemption Price, as the case may be, on such Preferred Securities held
in certificated form and will give the Paying Agent irrevocable instructions and
authority to pay the Redemption Price or the Optional Redemption Price, as the
case may be, to the Holders thereof upon surrender of their Preferred Securities
Certificates. Notwithstanding the foregoing, Distributions payable on or prior
to the Redemption Date for any Trust Securities called for redemption shall be
payable to the Holders of such Trust Securities as they appear on the Securities
Register for the Trust Securities on the relevant record dates for the related
Distribution Dates. If notice of redemption shall have been given and funds
deposited as required, then, upon the date of such deposit, all rights of
Securityholders holding Trust Securities so called for redemption will cease,
except (i) the right of such Securityholders to receive the Redemption Price or
the Optional Redemption Price, as the case may be, but without interest, and
(ii) the right to convert such Preferred Securities into Common Stock in the
manner provided in Section 4.3 through the close of business on the Redemption
Date; and such Trust Securities will cease to be Outstanding. In the event that
any date on which any Redemption Price or the Optional Redemption Price, as the
case may be, is payable is not a Business Day, then payment of the Redemption
Price or the Optional Redemption Price, as the case may be, payable on such date
will be made on the next succeeding day which is a Business Day (and without any
interest or other payment in respect of any such delay), except that, if such
Business Day is in the next succeeding calendar year, such payment shall be made
on the immediately preceding Business Day, in each case, with the same force and
effect as if made on such date. Payment of the Redemption Price or the Optional
Redemption Price, as the case may be, shall be made to the Holders of such Trust
Securities as they appear on the Securities Register for the Trust Securities on
the relevant record date, which shall be the date which is the fifteenth day
(whether or not a Business Day) preceding such Redemption Date.

          (e)  If less than all the Outstanding Trust Securities are to be
redeemed on a Redemption Date, then the

                                      25

 
aggregate Liquidation Amount of Trust Securities to be redeemed shall be
allocated on a pro rata basis (based on Liquidation Amounts) among the Common
               --------
Securities and the Preferred Securities that are to be redeemed. The particular
Preferred Securities to be redeemed shall be selected not more than 60 days
prior to the Redemption Date by the Property Trustee from the Outstanding
Preferred Securities not previously called for redemption, by lot or by such
other method as the Property Trustee shall deem fair and appropriate and which
may provide for the selection for redemption of portions (equal to $50 or an
integral multiple of $50 in excess thereof) of the Liquidation Amount of the
Preferred Securities. The Property Trustee shall promptly notify the Securities
Registrar and the Conversion Agent in writing of the Preferred Securities
selected for redemption and, in the case of any Preferred Securities selected
for partial redemption, the Liquidation Amount thereof to be redeemed; it being
understood that, in the case of Preferred Securities registered in the name of
and held of record by the Clearing Agency (or any successor) or any nominee, the
distribution of the proceeds of such redemption will be made in accordance with
the procedures of the Clearing Agency or its nominee. For all purposes of this
Trust Agreement, unless the context otherwise requires, all provisions relating
to the redemption of Preferred Securities shall relate, in the case of any
Preferred Securities redeemed or to be redeemed only in part, to the portion of
the Liquidation Amount of Preferred Securities which has been or is to be
redeemed. In the event of any redemption in part, the Trust shall not be
required to (i) issue, register the transfer of or exchange of any Preferred
Security during a period beginning at the opening of business 15 days before any
selection for redemption of Preferred Securities and ending at the close of
business on the earliest date in which the relevant notice of redemption is
deemed to have been given to all Holders of Preferred Securities to be so
redeemed or (ii) register the transfer of or exchange of any Preferred
Securities so selected for redemption, in whole or in part, except for the
unredeemed portion of any Preferred Securities being redeemed in part.

          (f)  In the event of any redemption, the Trust shall not be required
to issue, register the transfer of or register the exchange of any Preferred
Security during a period beginning at the opening of business 15 days before any
Redemption Date and ending at the close of business on such Redemption Date.

          [SECTION 4.3.  Conversion.  The Holders of Trust Securities, subject
                         -----------                                          
to the limitations set forth in this Section, shall have the right, at their
option, to cause the

                                      26

 
Conversion Agent to convert Trust Securities, on behalf of the converting
Holders, into shares of Common Stock in the manner described herein on and
subject to the following terms and conditions:

          (i)  The Trust Securities will be convertible into fully paid and
     nonassessable shares of Common Stock pursuant to the Holders direction to
     the Conversion Agent to exchange such Trust Securities for a portion of the
     Debentures having a principal amount equal to the aggregate Liquidation
     Amount of such Trust Securities, and promptly convert such amount of
     Debentures into fully paid and nonassessable shares of Common Stock at an
     initial rate of [     ] shares of Common Stock for each Trust Security 
     (which is equivalent to a conversion price of approximately $[     ] per 
     $50 principal amount of Debentures), subject to certain adjustments set 
     forth in the Indenture (as so adjusted, the "Conversion Price").

         (ii)  In order to convert Trust Securities into Common Stock, the
     Holder of such Trust Securities shall submit to the Conversion Agent an
     irrevocable Notice of Conversion to convert Trust Securities on behalf of
     such Holder, together, if the Trust Securities are in certificated form,
     with such certificates. The Notice of Conversion shall (i) set forth the
     number of Trust Securities to be converted and the name or names, if other
     than the Holder, in which the shares of Common Stock should be issued and
     (ii) direct the Conversion Agent (a) to exchange such Trust Securities for
     a portion of the Debentures held by the Property Trustee (at the rate of
     exchange specified in the preceding paragraph) and (b) to promptly convert
     such Debentures, on behalf of such Holder, into Common Stock (at the
     conversion rate specified in the preceding paragraph). The Conversion Agent
     shall notify the Property Trustee in writing of the Holder's election to
     exchange Trust Securities for a portion of the Debentures held by the
     Property Trustee and the Property Trustee shall, upon receipt of such
     written notice, deliver to the Conversion Agent the appropriate principal
     amount of Debentures for exchange in accordance with this Section. The
     Conversion Agent shall thereupon notify the Depositor of the Holder's
     election to convert such Debentures into shares of Common Stock. Holders of
     Trust Securities at the close of business on a Distribution payment record
     date will be entitled to receive the Distribution paid on such Trust
     Securities on the corresponding Distribution Date notwithstanding the
     conversion of such Trust Securities on or following

                                      27

 
     such record date but prior to such distribution Date. Except as provided
     above, neither the Trust nor the Depositor will make, or be required to
     make, any payment, allowance or adjustment upon any conversion on account
     of any accumulated and unpaid Distributions whether or not in arrears
     accrued on the Trust Securities surrendered for conversion, or on account
     of any accumulated and unpaid dividends on the shares of Common Stock
     issued upon such conversion. Trust Securities submitted for conversion
     prior to the expiration of conversion rights as provided in Section
     4.3(iii) shall be deemed to have been converted immediately prior to the
     close of business on the day on which an irrevocable Notice of Conversion
     relating to such Trust Securities is received by the Conversion Agent in
     accordance with the foregoing provision (the "Conversion Date"). The Person
     or Persons entitled to receive the Common Stock issuable upon conversion of
     the Debentures shall be treated for all purposes as the record holder or
     holders of such Common Stock on the Conversion Date of conversion. As
     promptly as practicable on or after the Conversion Date, the Depositor
     shall issue and deliver at the office of the Conversion Agent a certificate
     or certificates for the number of full shares of Common Stock issuable upon
     such conversion, together with the cash payment, if any, in lieu of any
     fraction of any share to the Person or Persons entitled to receive the
     same, unless otherwise directed by the Holder in the notice of conversion
     and the Conversion Agent shall distribute such certificate or certificates
     to such Person or Persons.

        (iii)  The conversion rights of holders of the Debentures and the
     corresponding conversion rights of Holders of Trust Securities shall expire
     at the close of business on the date set for redemption of the Trust
     Securities upon the mandatory or optional redemption of the Debentures.

         (iv)  Each Holder of a Trust Security by its acceptance thereof 
     initially appoints [                     ] not in its individual capacity
     but solely as conversion agent (the "Conversion Agent") for the purpose of
     effecting the conversion of Trust Securities in accordance with this
     Section. In effecting the conversion and transactions described in this
     Section, the Conversion Agent shall be acting as agent of the Holders of
     Trust Securities directing it to effect such conversion transactions. The
     Conversion Agent is hereby authorized (i) to exchange Trust Securities from

                                      28

 
     time to time for Debentures held by the Trust in connection with the
     conversion of such Trust Securities in accordance with this Section and
     (ii) to convert all or a portion of the Debentures into Common Stock and
     thereupon to deliver such shares of Common Stock in accordance with the
     provisions of this Section and to deliver to the Property Trustee any new
     Debenture or Debentures for any resulting unconverted principal amount
     delivered to the Conversion Agent by the Debenture Trustee.

          (v)  No fractional shares of Common Stock will be issued as a result
     of conversion, but, in lieu thereof, such fractional interest will be paid
     in cash by the Depositor to the Conversion Agent in an amount equal to the
     Current Market Price of the fractional share of the Common Stock, and the
     Conversion Agent will in turn make such payment to the Holder or Holders of
     Trust Securities so converted.

         (vi)  Nothing in this Section 4.3 shall limit the requirement of the
     Trust to withhold taxes pursuant to the terms of the Trust Securities or as
     set forth in this Trust Agreement or otherwise required of the Property
     Trustee or the Trust to pay any amounts on account of such withholdings.]

          SECTION 4.4.  Special Event Exchange or Redemption.  (a)  If a Special
                        -------------------------------------                   
Event shall occur and be continuing, the Property Trustee shall direct the
Conversion Agent to exchange all Outstanding Trust Securities for Debentures
having a principal amount equal to the aggregate Liquidation Amount of the Trust
Securities to be exchanged and with accrued interest in an amount equal to any
unpaid Distribution (including any Additional Amounts) on the Trust Securities;
provided, however, that, in the case of a Tax Event, the Depositor shall have
- --------  -------                                                            
the right to (i) direct that less than all, or none, as appropriate, of the
Trust Securities be so exchanged if and for so long as the Depositor shall have
elected to pay any Additional Sums (as defined in the Indenture) such that the
amount received by Holders of Trust Securities not so exchanged in respect of
Distributions and other distributions are not reduced as a result of such Tax
Event, and shall not have revoked any such election or failed to make such
payments or (ii) cause the Trust Securities to be redeemed in the manner set
forth below.  If a Tax Event shall occur and be continuing, the Depositor shall
have the right, upon not less than 30 nor more than 60 days' notice, to redeem
the Debentures, in whole or in part, for cash upon the later of (i) 90 days
following the occurrence of such Tax Event or

                                      29

 
(ii) [                ].  Promptly following such redemption, Trust Securities
with an aggregate Liquidation Amount equal to the aggregate principal amount of
the Debentures so redeemed will be redeemed by the Trust at the Optional
Redemption Price applicable in the event of a redemption upon the occurrence of
a Tax Event on a pro rata basis.
                 --------       

          (b)  Notice of any exchange pursuant to this Section 4.4 (an "Exchange
Notice") of the Trust Securities, which Exchange Notice shall be irrevocable,
will be given by the Property Trustee by first-class mail to the Depositor and
to each record Holder of Trust Securities to be exchanged not fewer than 30 nor
more than 60 days prior to the date fixed for exchange thereof. For purposes of
the calculation of the date of exchange and the dates on which notices are given
pursuant to this paragraph (b), an Exchange Notice shall be deemed to be given
on the day such notice is first mailed by first-class mail, postage prepaid, to
each Holder. Each Exchange Notice shall be addressed to each Holder of Trust
Securities at the address of such Holder appearing in the Securities Register.
Each Exchange Notice shall state: (A) the exchange date; (B) the aggregate
Liquidation Amount and any unpaid Distributions (including any Additional
Amounts) on the Trust Securities to be exchanged and the aggregate principal
amount and any accrued interest on the Debentures to be exchanged therefor; (C)
that on the exchange date the Trust Securities to be so exchanged shall be
exchanged for Debentures and that Distributions on the Trust Securities so
exchanged will cease to accumulate on and after said date; (D) the record date
for the determination of Holders of Trust Securities to be exchanged as provided
in Section 4.4(g); and (E) the identity of the Conversion Agent, if any, and the
place or places where each Trust Certificate to be exchanged is to be
surrendered in exchange for Debentures. No defect in the Exchange Notice or in
the mailing thereof with respect to any Trust Security shall affect the validity
of the exchange proceedings for any other Trust Security.

          (c)  In the event that fewer than all the Outstanding Preferred
Securities are to be exchanged, then, on the exchange date, (i) if all of the
Outstanding Preferred Securities are represented by Definitive Preferred
Securities Certificates, the particular Preferred Securities to be exchanged
will be selected by the Property Trustee from the Outstanding Preferred
Securities not previously called for redemption or exchange on a pro rata basis,
                                                                 --------
and (ii) if all of the Outstanding Preferred Securities are represented by Book-
Entry Preferred Securities Certificates, the Property Trustee shall provide for
the selection for

                                      30

 
exchange of a portion of the Global Certificate representing the Book-Entry
Preferred Securities Certificates on a pro rata basis.  In the case of clause
                                       --------                              
(ii) above, the particular Book-Entry Preferred Securities Certificates to be
exchanged shall be selected in accordance with the applicable rules and
procedures for the Clearing Agency in whose name, or whose nominee's name, such
Global Certificate is then held. Any Preferred Securities Certificate that is to
be exchanged only in part shall be surrendered with due endorsement or by a
written instrument of transfer fully executed by the Holder thereof (or its
attorney duly authorized in writing) and the Trust shall prepare and deliver to
such Holder, without service charge, a new Preferred Securities Certificate or
Certificates in aggregate stated Liquidation Amount equal to, and in exchange
for, the unredeemed portion of the Preferred Securities Certificate so
surrendered. The Common Securities shall be exchanged in a similar manner.

          (d)  In the event of an exchange pursuant to this Section 4.4, on the
date fixed for any such exchange, (i) if the Preferred Securities are
represented by Book-Entry Preferred Securities Certificates, the Clearing Agency
or its nominee, as the record Holder of the Preferred Securities, will exchange
through the Conversion Agent the Global Certificate representing the Preferred
Securities to be exchanged for a registered Global Certificate or certificates
representing the Debentures to be delivered upon such exchange, (ii) if the
Preferred Securities are represented by Definitive Preferred Securities
Certificates, the certificates representing the Preferred Securities to be so
exchanged will be deemed to represent Debentures having a principal amount equal
to the aggregate stated Liquidation Amount of such Preferred Securities until
such certificates are presented to the Conversion Agent for exchange for
definitive certificates representing Debentures and (iii) all rights of the
Holders of the Preferred Securities so exchanged will cease, except for the
right of such Holders to receive Debentures. The Common Securities shall be
exchanged in a similar manner.

          (e)  Each Holder, by becoming a party to this Trust Agreement pursuant
to Section 10.11 of this Trust Agreement, will be deemed to have agreed to be
bound by these exchange provisions in regard to the exchange of Trust Securities
for Debentures pursuant to the terms described above.

          (f)  Nothing in this Section 4.4 shall limit the requirement of the
Trust to withhold taxes pursuant to the terms of the Trust Securities or as set
forth in this Trust

                                      31

 
Agreement or otherwise require the Property Trustee or the Trust to pay any
amounts on account of such withholdings.

          (g)  An exchange of Trust Securities for Debentures pursuant to this
Section 4.4 shall be made to Holders of Trust Securities as they appear on the
Securities Register for Trust Securities on the relevant record date, which
shall be the date which is the fifteenth day (whether or not a Business Day)
preceding the exchange date.

          SECTION 4.5.  Subordination of Common Securities. Payment of
                        -----------------------------------           
Distributions (including Additional Amounts, if applicable) on, and the 
Redemption Price of, the Trust Securities, as applicable, shall be made pro rata
                                                                        --------
based on the Liquidation Amount of the Trust Securities; provided, however, that
                                                         --------  -------      
if on any Distribution Date or Redemption Date an Event of Default shall have
occurred and be continuing, no payment of any Distribution (including Additional
Amounts, if applicable) on, or the Redemption Price of, any Common Security, and
no other payment on account of the redemption, liquidation or other acquisition
of Common Securities, shall be made unless payment in full in cash of all
accumulated and unpaid Distributions (including Additional Amounts, if
applicable) on all Outstanding Preferred Securities for all Distribution periods
terminating on or prior thereto, or in the case of payment of the Redemption
Price the full amount of such Redemption Price on all Outstanding Preferred
Securities to be redeemed, shall have been made or provided for, and all funds
immediately available to the Property Trustee shall first be applied to the
payment in full in cash of all Distributions (including Additional Amounts, if
applicable) on, or the Redemption Price of, Preferred Securities then due and
payable.

          SECTION 4.6.  Payment Procedures.  Payments in respect of the
                        -------------------                            
Preferred Securities shall be made by check mailed to the address of the Person
entitled thereto as such address shall appear on the Securities Register or, if
the Preferred Securities are held by a Clearing Agency, such Distributions shall
be made to the Clearing Agency in immediately available funds, in accordance
with the Certificate Depositary Agreement on the applicable Distribution Dates.
Payments in respect of the Common Securities shall be made in such manner as
shall be mutually agreed between the Property Trustee and the Holder of the
Common Securities.

          SECTION 4.7.  Tax Returns and Reports.  The Administrative Trustees
                        ------------------------                             
shall prepare (or cause to be prepared), at the Depositor's expense, and file
all United

                                      32

 
States Federal, State and local tax and information returns and reports required
to be filed by or in respect of the Trust. In this regard, the Administrative
Trustees shall (a) prepare and file (or cause to be prepared or filed) Form 1041
or the appropriate Internal Revenue Service form required to be filed in respect
of the Trust in each taxable year of the Trust and (b) prepare and furnish (or
cause to be prepared and furnished) to each Securityholder a Form 1099 or the
appropriate Internal Revenue Service form required to be furnished to such
Securityholder or the information required to be provided on such form. The
Administrative Trustees shall provide the Depositor with a copy of all such
returns, reports and schedules promptly after such filing or furnishing. The
Trustees shall comply with United States Federal withholding and backup
withholding tax laws and information reporting requirements with respect to any
payments to Securityholders under the Trust Securities.

          SECTION 4.8.  Payment of Taxes, Duties, Etc., of the Trust.  Upon
                        ---------------------------------------------      
receipt under the Debentures of Additional Sums, the Property Trustee, upon
receipt of written notice from the Depositor or the Administrative Trustees,
shall promptly pay from such Additional Sums any taxes, duties or governmental
charges of whatsoever nature (other than withholding taxes) imposed on the Trust
by the United States or any other taxing authority.

          SECTION 4.9.  Payments under Indenture.  Any amount payable hereunder
                        -------------------------                              
to any Holder of Preferred Securities shall be reduced by the amount of any
corresponding payment such Holder (or any Owner with respect thereto) has
directly received pursuant to Section [5.8] of the Indenture in accordance with
the terms of Section 6.8 hereof.


                                   ARTICLE 5
                         TRUST SECURITIES CERTIFICATES

          SECTION 5.1.  Initial Ownership.  Upon the creation of the Trust and
                        ------------------                                    
until the issuance of the Trust Securities, and at any time during which no
Trust Securities are Outstanding, the Depositor shall be the sole beneficial
owner of the Trust.

          SECTION 5.2.  The Trust Securities Certificates. The Preferred
                        ----------------------------------              
Securities Certificates shall be issued in minimum denominations of $50
Liquidation Amount and integral multiples of $50 in excess thereof, and the
Common Securities Certificates shall be issued in denominations of

                                      33

 
$50 Liquidation Amount and integral multiples thereof. The consideration
received by the Trust for the issuance of the Trust Securities shall constitute
a contribution to the capital of the Trust and shall not constitute a loan to
the Trust. The Trust Securities Certificates shall be executed on behalf of the
Trust by manual or facsimile signature of at least one Administrative Trustee
and authenticated by the Property Trustee. Preferred Securities initially will
be represented by one or more certificates in registered global form (the
"Global Certificates"). Trust Securities Certificates bearing the manual or
facsimile signatures of individuals who were, at the time when such signatures
shall have been affixed, authorized to sign on behalf of the Trust, shall be
validly issued and entitled to the benefit of this Trust Agreement,
notwithstanding that such individuals or any of them shall have ceased to be so
authorized prior to the delivery of such Trust Securities Certificates or did
not hold such offices at the date of delivery of such Trust Securities
Certificates. A transferee of a Trust Securities Certificate shall become a
Securityholder, and shall be entitled to the rights and subject to the
obligations of a Securityholder hereunder, upon due registration of such Trust
Securities Certificate in such transferee's name pursuant to Section 5.4.

          SECTION 5.3.  Delivery of Trust Securities Certificates.  On the
                        ------------------------------------------        
Closing Date, the Administrative Trustees shall cause Trust Securities
Certificates, in an aggregate Liquidation Amount as provided in Sections 2.4 and
2.5, to be executed on behalf of the Trust and delivered to or upon the written
order of the Depositor, signed by its Chairman of the Board, any Vice Chairman,
its President, any Senior Vice President or any Vice President, Treasurer or
Assistant Treasurer or Controller without further corporate action by the
Depositor, in authorized denominations.

          A Trust Security Certificate shall not be valid until authenticated by
the manual signature of an authorized signatory of the Property Trustee.  The
signature shall be conclusive evidence that the Trust Security Certificate has
been authenticated under this Trust Agreement.  Upon a written order of the
Trust signed by one Administrative Trustee, the Property Trustee shall
authenticate the Trust Security Certificates for original issue.

          The Property Trustee may appoint an authenticating agent acceptable to
the Administrative Trustees to authenticate Trust Security Certificates.  An
authenticating agent may authenticate Trust Security Certificates whenever the
Property Trustee may do so.  Each reference in this Trust Agreement to
authentication by the Property Trustee

                                      34

 
includes authentication by such agent. An authenticating agent has the same
rights as the Property Trustee to deal with the Depositor or an Affiliate with
respect to the authentication of Trust Securities.

          SECTION 5.4.  Registration of Transfer and Exchange of Preferred
                        --------------------------------------------------
Securities; Restrictions on Transfer. The Securities Registrar shall keep or
- -------------------------------------                                       
cause to be kept, at the office or agency maintained pursuant to Section 5.8, a
Securities Register in which, subject to such reasonable regulations as it may
prescribe, the Securities Registrar shall provide for the registration of
Preferred Securities Certificates and Common Securities Certificates (subject to
Section 5.10 in the case of the Common Securities Certificates) and registration
of transfers and exchanges of Preferred Securities Certificates as herein
provided. The Property Trustee shall be the initial Securities Registrar.

          Upon surrender for registration of transfer of any Preferred Security
at an office or agency of the Securities Registrar designated pursuant to
Section 5.8 for such purpose, an Administrative Trustee shall execute on behalf
of the Trust by manual or facsimile signature, and the Property Trustee shall
authenticate and deliver, in the name of the designated transferee or
transferees, one or more new Preferred Securities of any authorized
denominations and of a like aggregate Liquidation Amount.

          At the option of the Holder, and subject to the other provisions of
this Section 5.4, Preferred Securities may be exchanged for other Preferred
Securities of any authorized denomination and of a like Liquidation Amount, upon
surrender of the Preferred Securities to be exchanged at any such office or
agency.  Whenever any Preferred Securities are so surrendered for exchange, an
Administrative Trustee shall execute on behalf of the Trust by manual or
facsimile signature, and the Property Trustee shall authenticate and deliver,
the Preferred Securities which the Holder making the exchange is entitled to
receive.

          All Preferred Securities issued upon any registration of transfer or
exchange of Preferred Securities shall be entitled to the same benefits under
this Trust Agreement as the Preferred Securities surrendered upon such
registration of transfer or exchange.

          Every Preferred Security presented or surrendered for registration of
transfer or for exchange shall (if so requested by the Depositor or the
Securities Registrar) be duly endorsed, or be accompanied by a written
instrument of transfer in form satisfactory to the Depositor and the

                                      35

 
Securities Registrar duly executed, by the Holder thereof or his attorney duly
authorized in writing.

          No service charge shall be made for any registration of transfer or
exchange of Preferred Securities Certificates, but the Securities Registrar may
require payment of a sum sufficient to cover any tax or governmental charge that
may be imposed in connection with any transfer or exchange of Preferred
Securities Certificates.

          SECTION 5.5.  Mutilated, Destroyed, Lost or Stolen Trust Securities
                        -----------------------------------------------------
Certificates.  If (a) any mutilated Trust Securities Certificate shall be
- -------------                                                            
surrendered to the Securities Registrar, or if the Securities Registrar shall
receive evidence to its satisfaction of the destruction, loss or theft of any
Trust Securities Certificate and (b) there shall be delivered to the Securities
Registrar and the Administrative Trustees such security or indemnity as may be
required by them to save each of them harmless, then in the absence of notice
that such Trust Securities Certificate shall have been acquired by a bona fide
purchaser, the Administrative Trustees, or any one of them, on behalf of the
Trust shall execute and make available for authentication and delivery, in
exchange for or in lieu of any such mutilated, destroyed, lost or stolen Trust
Securities Certificate, a new Trust Securities Certificate of like denomination.
In connection with the issuance of any new Trust Securities Certificate under
this Section, the Securities Registrar may require the payment of a sum
sufficient to cover any tax or other governmental charge that may be imposed in
connection therewith. Any duplicative Trust Securities Certificate issued
pursuant to this Section shall constitute conclusive evidence of an undivided
beneficial interest in the assets of the Trust, as if originally issued, whether
or not the lost, stolen or destroyed Trust Securities Certificate shall be found
at any time.

          SECTION 5.6.  Persons Deemed Securityholders. Each Trustee and the
                        -------------------------------                     
Securities Registrar shall treat the Person in whose name any Trust Securities
Certificate shall be registered in the Securities Register as the owner of such
Trust Securities Certificate for the purpose of receiving Distributions and for
all other purposes whatsoever, and none of the Trustees nor the Securities
Registrar shall be bound by any notice to the contrary.

          SECTION 5.7.  Access to List of Securityholders' Names and Addresses.
                        ------------------------------------------------------- 
The Administrative Trustees or the Depositor shall furnish or cause to be
furnished (unless the Property Trustee is acting as Securities Registrar with

                                      36

 
respect to the Trust Securities under the Trust Agreement) a list, in such form
as the Property Trustee may reasonably require, of the names and addresses of
the Securityholders as of the most recent record date (a) to the Property
Trustee, quarterly at least five Business Days before each Distribution Date,
and (b) to the Property Trustee, promptly after receipt by the Depositor of a
written request therefor from the Property Trustee in order to enable the
Property Trustee to discharge its obligations under this Trust Agreement, in
each case to the extent such information is in the possession or control of the
Administrative Trustees or the Depositor and is not identical to a previously
supplied list or has not otherwise been received by the Property Trustee in its
capacity as Securities Registrar. The rights of Securityholders to communicate
with other Securityholders with respect to their rights under this Trust
Agreement or under the Trust Securities, and the corresponding rights of the
Trustee shall be as provided in the Trust Indenture Act, except to the extent
Section 3819 of the Delaware Business Trust Act would require greater access to
such information, in which case the latter shall apply. Each Holder, by
receiving and holding a Trust Securities Certificate, and each Owner shall be
deemed to have agreed not to hold the Depositor, the Property Trustee or the
Administrative Trustees accountable by reason of the disclosure of its name and
address, regardless of the source from which such information was derived.

          SECTION 5.8.  Maintenance of Office or Agency. The Securities
                        --------------------------------               
Registrar shall maintain in The City of New York an office or offices or agency
or agencies where Preferred Securities Certificates may be surrendered for
registration of transfer, exchange or conversion and where notices and demands
to or upon the Trustees in respect of the Trust Securities Certificates may be
served.  The Securities Registrar initially designates [                    ,
New York, New York [   ], Attention: [                              ], as its
principal corporate trust office for such purposes.  The Securities Registrar
shall give prompt written notice to the Depositor and to the Securityholders of
any change in the location of the Securities Register or any such office or
agency.

          SECTION 5.9.  Appointment of Paying Agent.  In the event that the
                        ----------------------------                       
Preferred Securities are not in book-entry form only, the Trust shall maintain
in the Borough of Manhattan, City of New York, an office or agency (the "Paying
Agent") where the Preferred Securities may be presented for payment. The Paying
Agent shall make Distributions to Securityholders from the Payment Account and
shall report the amounts of such Distributions to the

                                      37

 
Property Trustee and the Administrative Trustees.  Any Paying Agent shall have
the revocable power to withdraw funds from the Payment Account for the purpose
of making the Distributions referred to above.  The Administrative Trustees may
revoke such power and remove the Paying Agent if such Trustees determine in
their sole discretion that the Paying Agent shall have failed to perform its
obligations under this Trust Agreement in any material respect.  The Paying
Agent shall initially be the Property Trustee, and any co-paying agent chosen by
the Property Trustee and acceptable to the Administrative Trustees and the
Depositor. Any Person acting as Paying Agent shall be permitted to resign as
Paying Agent upon 30 days' written notice to the Property Trustee and the
Depositor; provided, however, that no such resignation of the Paying Agent shall
           --------  -------                                                    
be effective until a successor Paying Agent has been appointed and has accepted
such appointment by instrument executed by such successor Paying Agent and
delivered to the Trust, the Depositor and the resigning Paying Agent.  In the
event that the Property Trustee shall no longer be the Paying Agent or a
successor Paying Agent shall resign or its authority to act be revoked, the
Administrative Trustees shall appoint a successor that is acceptable to the
Property Trustee and the Depositor to act as Paying Agent (which shall be a bank
or trust company).  Each successor Paying Agent or any additional Paying Agent
shall agree with the Trustees that, as Paying Agent, such successor Paying Agent
or additional Paying Agent will hold all sums, if any, held by it for payment to
the Securityholders in trust for the benefit of the Securityholders entitled
thereto until such sums shall be paid to each Securityholder.  The Paying Agent
shall return all unclaimed funds to the Property Trustee and upon removal of a
Paying Agent such Paying Agent shall also return all funds in its possession to
the Property Trustee. The provisions of Sections 8.1, 8.3 and 8.6 shall apply to
the Property Trustee also in its role as Paying Agent, for so long as the
Property Trustee shall act as Paying Agent and, to the extent applicable, to any
other paying agent appointed hereunder.  Any reference in this Agreement to the
Paying Agent shall include any co-paying agent unless the context requires
otherwise.

          SECTION 5.10.  Ownership of Common Securities by Depositor.  Upon the
                         --------------------------------------------          
issuance of Common Securities as provided for in Section 2.5, the Depositor
shall acquire beneficial and record ownership of the Common Securities. The
Depositor has covenanted in the Indenture to maintain directly or indirectly
100% ownership of the Common Securities, provided that any permitted successor
of the Company under the Indenture may succeed to the Company's ownership of the
Common Securities. To the fullest extent

                                      38

 
permitted by law, any attempted transfer of the Common Securities in violation
of that covenant shall be void. The Administrative Trustees shall cause each
Common Securities Certificate to contain a legend stating, "THIS CERTIFICATE IS
NOT TRANSFERABLE EXCEPT TO AN ENTITY WHOLLY OWNED BY ALUMINUM COMPANY OF AMERICA
OR TO CERTAIN SUCCESSORS OF ALUMINUM COMPANY OF AMERICA"

          SECTION 5.11.  Global Securities; Non-Global Securities; Common
                         ------------------------------------------------
Securities Certificate.  (a)  Each Global Certificate authenticated under this
- -----------------------                                                       
Trust Agreement shall be registered in the name of the Clearing Agency
designated by the Depositor for such Global Certificate or a nominee thereof and
delivered to such Clearing Agency or a nominee thereof or custodian therefor,
and each such Global Certificate shall constitute a Preferred Security for all
purposes of this Trust Agreement.

          (b)  If a Global Certificate is to be exchanged for Definitive
Preferred Securities Certificates or canceled in whole, it shall be surrendered
by or on behalf of the Clearing Agency, its nominee or custodian to the Property
Trustee, as Securities Registrar, for exchange or cancellation as provided in
this Article 5. If any Global Certificate is to be exchanged for Definitive
Preferred Securities Certificates or cancelled in part, or if another Preferred
Security is to be exchanged in whole or in part for a beneficial interest in any
Global Certificate, in each case, as provided in Section 5.4, then either (i)
such Global Certificate shall be so surrendered for exchange or cancellation as
provided in this Article 5 or (ii) the Liquidation Amount thereof (or number of
Preferred Securities represented thereby) shall be reduced or increased by an
amount equal to the portion, thereof to be so exchanged or cancelled, or equal
to the Liquidation Amount of (or number of securities represented by) such
Definitive Preferred Security Certificates to be so exchanged for a beneficial
interest therein, as the case may be, by means of an appropriate adjustment made
on the records of the Property Trustee, as Securities Registrar, whereupon the
Property Trustee, in accordance with the Applicable Procedures, shall instruct
the Clearing Agency or its authorized representative to make a corresponding
adjustment to its records. Upon any such surrender or adjustment of a Global
Certificate, an Administrative Trustee shall execute on behalf of the Trust by
manual or facsimile signature, and the Property Trustee shall, subject to
Section 5.4 and as otherwise provided in this Article 5, authenticate and
deliver any Preferred Securities issuable in exchange for such Global
Certificate (or any portion thereof) to or upon the written order of, and
registered in

                                      39

 
such names as may be directed by, the Clearing Agency or its authorized
representative.  Upon the request of the Property Trustee in connection with the
occurrence of any of the events specified in this paragraph, the Depositor shall
promptly make available to the Property Trustee a reasonable supply of Preferred
Securities that are not in the form of Global Certificates.  The Property
Trustee shall be entitled to conclusively rely upon any order, direction or
request of the Clearing Agency or its authorized representative which is given
or made pursuant to this Article 5 if such order, direction or request is given
or made in accordance with the Applicable Procedures.

          (c)  Every Preferred Security authenticated and delivered upon
registration of transfer of, or in exchange for or in lieu of, a Global
Certificate or any portion thereof, whether pursuant to this Article 5 or
otherwise, shall be authenticated and delivered in the form of, and shall be, a
Global Certificate, unless such Preferred Security is registered in the name of
a Person other than the Clearing Agency for such Global Certificate or a nominee
thereof.

          (d)  The Clearing Agency or its nominee, as registered owner of a
Global Certificate, shall be the Holder of such Global Certificate for all
purposes under this Trust Agreement and the Preferred Securities, and owners of
beneficial interests in a Global Certificate shall hold such interests pursuant
to the Applicable Procedures. Accordingly, any such Owner's beneficial interest
in a Global Certificate will be shown only on, and the transfer of such interest
shall be effected only through, records maintained by the Clearing Agency or its
nominee or its participants and such owners of beneficial interests in a Global
Certificate will not be considered the owners or Holders of such Global
Certificate for any purpose of this Trust Agreement or the Preferred Securities.

          (e)  A single Common Securities Certificate representing the Common
Securities shall initially be issued to the Depositor in the form of a
definitive Common Securities Certificate.

          SECTION 5.12.  Notices to Clearing Agency.  To the extent that a
                         ---------------------------                      
notice or other communication to the Owners is required under this Trust
Agreement, unless and until Definitive Preferred Securities Certificates shall
have been issued to Owners pursuant to Section 5.13, the Trustees shall give all
such notices and communications specified herein to be given to Owners to the
Clearing Agency, and

                                      40

 
shall have no obligations to provide notices directly to the Owners.

          SECTION 5.13.  Definitive Preferred Securities Certificates.
                         --------------------------------------------- 
Notwithstanding any other provision in this Trust Agreement, no Global
Certificate may be exchanged in whole or in part for Preferred Securities
registered, and no transfer of a Global Certificate in whole or in part may be
registered, in the name of any Person other than the Clearing Agency for such
Global Certificate or a nominee thereof unless (i) such Clearing Agency (A) has
notified the Trust and the Depositor that it is unwilling or unable to continue
as Clearing Agency for such Global Certificate or (B) has ceased to be a
clearing agency registered as such under the Securities Exchange Act of 1934, as
amended, and in either case the Trust and the Depositor thereupon fail to
appoint a successor Clearing Agency, (ii) the Trust and the Depositor, at their
option, notify the Property Trustee in writing that it elects to cause the
issuance of the Preferred Securities in certificated form or (iii) there shall
have occurred and be continuing an Event of Default or any event which after
notice or lapse of time or both would be an Event of Default. In all cases,
Definitive Preferred Securities Certificates delivered in exchange for any
Global Certificate or beneficial interests therein will be registered in the
names, and issued in any approved denominations, requested by or on behalf of
the Clearing Agency (in accordance with its customary procedures).

          SECTION 5.14.  Rights of Securityholders.  The legal title to the
                         --------------------------                        
Trust Property is vested exclusively in the Property Trustee (in its capacity as
such) in accordance with Section 2.9, and the Securityholders shall not have any
right or title therein other than the undivided beneficial interest in the
assets of the Trust conferred by their Trust Securities and they shall have no
right to call for any partition or division of property, profits or rights of
the Trust except as described below. The Trust Securities shall be personal
property giving only the rights specifically set forth therein and in this Trust
Agreement.  The Trust Securities shall have no preemptive or similar rights and,
when issued and delivered to Securityholders against payment of the purchase
price therefor, will be fully paid and nonassessable undivided beneficial
interests in the assets of the Trust.  The Holders of the Trust Securities, in
their capacities as such, shall be entitled to the same limitation of personal
liability extended to stockholders of private corporations for profit organized
under the General Corporation Law of the State of Delaware, provided, however,
                                                            --------  ------- 
the Holders of Trust Securities may be obligated, pursuant to the terms of this
Trust Agreement, to (i) provide

                                      41

 
indemnity and/or security in connection with and pay taxes or governmental
charges arising from transfers of Trust Securities and (ii) provide security and
indemnity in connection with the requests of or directions to the Property
Trustee to exercise its rights and powers under the Trust Agreement.

                                   ARTICLE 6
                   ACT OF SECURITYHOLDERS; MEETINGS; VOTING

          SECTION 6.1.  Limitations on Voting Rights. (a)  Except as provided in
                        -----------------------------                           
this Section, in Section 8.2 and 10.2 and in the Indenture and as otherwise
required by law, no Holder of Preferred Securities shall have any right to vote
or in any manner otherwise control the administration, operation and management
of the Trust or the obligations of the parties hereto, nor shall anything herein
set forth, or contained in the terms of the Trust Securities Certificates, be
construed so as to constitute the Securityholders from time to time as partners
or members of an association.

          (b)  Subject to Section 8.2 hereof, if an Event of Default with
respect to the Preferred Securities has occurred and been subsequently cured,
waived or otherwise eliminated, the provisions of Section 6.1(b)(ii) hereof
shall apply.  During (x) the period commencing on the date of the occurrence of
an Event of Default with respect to the Preferred Securities and ending on the
date when such Event of Default is cured, waived or otherwise eliminated, or (y)
any period not described in either the preceding sentence or the preceding
clause (x), the provisions of Section 6.1(b)(i) shall apply.

          (i)  The Holders of a majority in aggregate Liquidation Amount of the
     Preferred Securities will have the right to direct the time, method and
     place of conducting any proceeding for any remedy available to the Property
     Trustee or to exercise any trust or power conferred upon the Property
     Trustee under this Trust Agreement, including the right to direct the
     Property Trustee to exercise the remedies available to it as a holder of
     the Debentures but excluding the right to direct the Property Trustee to
     consent to an amendment, modification or termination of the Indenture
     (which shall be as provided below).  So long as any Debentures are held by
     the Property Trustee, the Trustees shall not (A) direct the time, method
     and place of conducting any proceeding for any remedy available to the
     Debenture Trustee, or executing any trust or power

                                      42

 
     conferred on the Debenture Trustee with respect to such Debentures, (B)
     waive any past default which is waivable under Section [5.13] of the
     Indenture, (C) exercise any right to rescind or annul a declaration that
     the principal of all the Debentures shall be due and payable or (D) consent
     to any amendment, modification or termination of the Indenture or the
     Debentures, where such consent shall be required, without, in each case,
     obtaining the prior approval of the Holders of a majority in aggregate
     Liquidation Amount of all Outstanding Preferred Securities (except in the
     case of clause (D), which consent, in the event that no Event of Default
     shall occur and be continuing, shall be of the Holders of a majority in
     aggregate Liquidation Amount of all Trust Securities, voting together as a
     single class); provided, however, that where a consent under the Indenture
                    --------  -------                                          
     would require the consent of each holder of Debentures affected thereby, no
     such consent shall be given by the Property Trustee without the prior
     written consent of each Holder of Preferred Securities.  The Trustees shall
     not revoke any action previously authorized or approved by a vote of the
     Holders of the Preferred Securities, except by a subsequent vote of the
     Holders of the Preferred Securities.  The Property Trustee shall notify all
     Holders of record of the Preferred Securities of any notice of default
     received from the Debenture Trustee with respect to the Debentures.  In
     addition to obtaining the foregoing approvals of the Holders of the
     Preferred Securities, prior to taking any of the foregoing actions, the
     Trustees shall, at the expense of the Depositor, obtain an Opinion of
     Counsel experienced in such matters to the effect that the Trust will not
     be classified as an association taxable as a corporation or partnership for
     United States Federal income tax purposes on account of such action.

          (ii)  Subject to Section 8.2 of this Trust Agreement and only after
     the Event of Default with respect to the Preferred Securities has been
     cured, waived, or otherwise eliminated, the Holders of a majority in
     aggregate Liquidation Amount of the Common Securities will have the right
     to direct the time, method and place of conducting any proceeding for any
     remedy available to the Property Trustee or to exercise any trust or power
     conferred upon the Property Trustee under this Trust Agreement, including
     the right to direct the Property Trustee to exercise the remedies available
     to it as a holder of the Debentures but excluding the right to direct the
     Property Trustee to

                                      43

 
     consent to an amendment, modification or termination of the Indenture
     (which shall be as provided below).  So long as any Debentures are held by
     the Property Trustee, the Trustees shall not (A) direct the time, method
     and place of conducting any proceeding for any remedy available to the
     Debenture Trustee, or executing any trust or power conferred on the
     Debenture Trustee with respect to such Debentures, (B) waive any past
     default which is waivable under Section 5.13 of the Indenture, (C) exercise
     any right to rescind or annul a declaration that the principal of all the
     Debentures shall be due and payable or (D) consent to any amendment,
     modification or termination of the Indenture or the Debentures, where such
     consent shall be required, without, in each case, obtaining the prior
     approval of the Holders of a majority in aggregate Liquidation Amount of
     all Common Securities (except in the case of clause (D), which consent, in
     the event that no Event of Default shall occur and be continuing, shall be
     of the Holders of a majority in aggregate Liquidation Amount of all Trust
     Securities, voting together as a single class); provided, however, that
                                                     --------  -------      
     where a consent under the Indenture would require the consent of each
     holder of Debentures affected thereby, no such consent shall be given by
     the Property Trustee without the prior written consent of each Holder of
     Common Securities.  The Trustees shall not revoke any action previously
     authorized or approved by a vote of the Holders of the Common Securities,
     except by a subsequent vote of the Holders of the Common Securities.  The
     Property Trustee shall notify all Holders of record of the Common
     Securities of any notice of default received from the Debenture Trustee
     with respect to the Debentures.  In addition to obtaining the foregoing
     approvals of the Holders of the Common Securities, prior to taking any of
     the foregoing actions, the Trustees shall, at the expense of the Depositor,
     obtain an Opinion of Counsel experienced in such matters to the effect that
     the Trust will not be classified as an association taxable as a corporation
     or partnership for United States Federal income tax purposes on account of
     such action.

          (iii)  The provisions of this Section 6.1(b) and Section 6.1(a) of
     this Trust Agreement shall be in lieu of (S) 316(a)(1)(A) of the Trust
     Indenture Act, and such (S) 316(a)(1)(A) is hereby expressly excluded from
     this Trust Agreement and the Preferred Securities, as permitted by the
     Trust Indenture Act.

                                      44

 
          (c)  If any proposed amendment to this Trust Agreement provides for,
or the Trustees otherwise propose to effect, the dissolution, winding-up or
termination of the Trust, other than pursuant to the terms of this Trust
Agreement, then the Holders of Outstanding Preferred Securities as a class will
be entitled to vote on such amendment or proposal and such amendment or proposal
shall not be effective except with the approval of the Holders of a majority in
aggregate Liquidation Amount of the Outstanding Preferred Securities.

          SECTION 6.2.  Notice of Meetings.  Notice of all meetings of the
                        -------------------                               
Holders of the Preferred Securities, stating the time, place and purpose of the
meeting, shall be given by the Property Trustee pursuant to Section 10.8 to each
Preferred Securityholder of record, at its registered address, at least 15 days
and not more than 90 days before the meeting.  At any such meeting, any business
properly before the meeting may be so considered whether or not stated in the
notice of the meeting.  Any adjourned meeting may be held as adjourned without
further notice.

          SECTION 6.3.  Meetings of Preferred Securityholders.  No annual
                        --------------------------------------           
meeting of Securityholders is required to be held.  The Administrative Trustees,
however, shall call a meeting of Securityholders to vote on any matter upon the
written request of the Preferred Securityholders of record of 25% of the
Preferred Securities (based upon their Liquidation Amount), and the
Administrative Trustees or the Property Trustee may, at any time in their
discretion, call a meeting of the Holders of Preferred Securities to vote on any
matters as to which such Holders are entitled to vote.

          Holders of record of a majority of the Preferred Securities (based
upon their Liquidation Amount), present in person or by proxy, shall constitute
a quorum at any meeting of Securityholders.

          If a quorum is present at a meeting, an affirmative vote by the
Holders of record of Preferred Securities present, in person or by proxy,
holding a majority of the Preferred Securities (based upon their Liquidation
Amount) held by Holders of record of Preferred Securities present, either in
person or by proxy, at such meeting shall constitute the action of the
Securityholders, unless this Trust Agreement requires a greater number of
affirmative votes.

          SECTION 6.4.  Voting Rights.  Securityholders shall be entitled to one
                        --------------                                          
vote for each $50 of Liquidation

                                      45

 
Amount represented by their Trust Securities in respect of any matter as to
which such Securityholders are entitled to vote.  Notwithstanding that Holders
of Preferred Securities are entitled to vote or consent under any of the
circumstances described above, any of the Preferred Securities that are owned at
such time by the Depositor, the Trustees or any affiliate of any Trustee shall,
for purposes of such vote or consent, be treated as if such Preferred Securities
were not outstanding.

          SECTION 6.5.  Proxies, Etc.  At any meeting of Securityholders, any
                        -------------                                        
Securityholders entitled to vote thereat may vote by proxy, provided that no
proxy shall be voted at any meeting unless it shall have been placed on file
with the Administrative Trustees, or with such other officer or agent of the
Trust as the Administrative Trustees may direct, for verification prior to the
time at which such vote shall be taken.  Pursuant to a resolution of the
Property Trustee, proxies may be solicited in the name of the Property Trustee
or one or more officers of the Property Trustee.  Only Securityholders of record
shall be entitled to vote.  When Trust Securities are held jointly by several
Persons, any one of them may vote at any meeting in person or represented by
proxy in respect of such Trust Securities, but if more than one of them shall be
present at such meeting in person or by proxy, and such joint owners or their
proxies so present disagree as to any vote to be cast, such vote shall not be
received in respect of such Trust Securities.  A proxy purporting to be executed
by or on behalf of a Securityholder shall be deemed valid unless challenged at
or prior to its exercise, and the burden of proving invalidity shall rest on the
challenger.  No proxy shall be valid more than three years after its date of
execution.

          SECTION 6.6.  Securityholder Action by Written Consent.  Any action
                        -----------------------------------------            
which may be taken by Securityholders at a meeting may be taken without a
meeting if Securityholders holding a majority of all Outstanding Trust
Securities (based upon their Liquidation Amount) entitled to vote in respect of
such action (or such larger proportion thereof as shall be required by any
express provision of this Trust Agreement) shall consent to the action in
writing.

          SECTION 6.7.  Record Date for Voting and Other Purposes.  For the
                        ------------------------------------------         
purposes of determining the Securityholders who are entitled to notice of and to
vote at any meeting or by written consent, or to participate in any Distribution
on the Trust Securities in respect of which a record date is not otherwise
provided for in this Trust

                                      46

 
Agreement, or for the purpose of any other action, the Property Trustee may from
time to time fix a date, not more than 90 days prior to the date of any meeting
of Securityholders or the payment of Distributions or other action, as the case
may be, as a record date for the determination of the identity of the
Securityholders of record for such purposes.

          SECTION 6.8.  Acts of Securityholders.  Any request, demand,
                        ------------------------                      
authorization, direction, notice, consent, waiver or other action provided or
permitted by this Trust Agreement to be given, made or taken by Securityholders
or Owners may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Securityholders or Owners in person
or by an agent duly appointed in writing; and, except as otherwise expressly
provided herein, such action shall become effective when such instrument or
instruments are delivered to an Administrative Trustee.  Such instrument or
instruments (and the action embodied therein and evidenced thereby) are herein
sometimes referred to as the "Act" of the Securityholders or Owners signing such
instrument or instruments.  Proof of execution of any such instrument or of a
writing appointing any such agent shall be sufficient for any purpose of this
Trust Agreement and (subject to Section 8.1) conclusive in favor of the
Trustees, if made in the manner provided in this Section.

          The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof.  Where
such execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority.  The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which any Trustee receiving the same deems sufficient.

          The ownership of Preferred Securities shall be proved by the
Securities Register.

          Any request, demand, authorization, direction, notice, consent, waiver
or other Act of the Securityholder of any Trust Security shall bind every future
Securityholder of the same Trust Security and the Securityholder of every Trust
Security issued upon the registration of transfer

                                      47

 
thereof or in exchange therefor or in lieu thereof in respect of anything done,
omitted or suffered to be done by the Trustees or the Trust in reliance thereon,
whether or not notation of such action is made upon such Trust Security.

          Without limiting the foregoing, a Securityholder entitled hereunder to
take any action hereunder with regard to any particular Trust Security may do so
with regard to all or any part of the Liquidation Amount of such Trust Security
or by one or more duly appointed agents each of which may do so pursuant to such
appointment with regard to all or any part of such Liquidation Amount.

          If any dispute shall arise between the Securityholders and the
Administrative Trustees or among such Securityholders or Administrative Trustees
with respect to the authenticity, validity or binding nature of any request,
demand, authorization, direction, consent, waiver or other Act of such
Securityholder or Trustee under this Article 6, then the determination of such
matter by the Property Trustee shall be conclusive with respect to such matter.

          Upon the occurrence and continuation of an Event of Default, the
Holders of Preferred Securities shall rely on the enforcement by the Property
Trustee of its rights as holder of the Debentures against the Depositor.  If the
Property Trustee fails to enforce its rights as holder of the Debentures after a
request therefor by a Holder of Preferred Securities, such holder may proceed to
enforce such rights directly against the Depositor.  Notwithstanding the
foregoing, if an Event of Default has occurred and is continuing and such event
is attributable to the failure of the Depositor to pay interest or principal on
the Debentures on the date such interest or principal is otherwise payable (or
in the case of redemption, on the Redemption Date), then a Holder of Preferred
Securities shall have the right to institute a proceeding directly against the
Depositor, for enforcement of payment to such holder of the principal amount of
or interest on Debentures having a principal amount equal to the aggregate
Liquidation Amount of the Preferred Securities of such Holder after the
respective due date specified in the Debentures (a "Direct Action").  In
connection with any such Direct Action, the rights of the Depositor will be
subrogated to the rights of any Holder of the Preferred Securities to the extent
of any payment made by the Depositor to such Holder of Preferred Securities as a
result of such Direct Action.

                                      48

 
          SECTION 6.9.  Inspection of Records.  Upon reasonable notice to the
                        ----------------------                               
Administrative Trustees and the Property Trustee, the records of the Trust shall
be open to inspection by Securityholders during normal business hours for any
purpose reasonably related to such Securityholder's interest as a
Securityholder.


                                   ARTICLE 7
                         REPRESENTATIONS AND WARRANTIES

          SECTION 7.1.  Representations and Warranties of the Property Trustee
                        ------------------------------------------------------
and the Delaware Trustee.
- -------------------------

          (a) The Property Trustee hereby represents and warrants for the
     benefit of the Depositor and the Securityholders that:

               (i)    the Property Trustee is a banking corporation duly
          organized, validly existing and in good standing under the laws of the
          State of New York;

               (ii)   the Property Trustee has full corporate power, authority
          and legal right to execute, deliver and perform its obligations under
          this Trust Agreement and has taken all necessary action to authorize
          the execution, delivery and performance by it of this Trust Agreement;

               (iii)  this Trust Agreement has been duly authorized, executed
          and delivered by the Property Trustee and constitutes the valid and
          legally binding agreement of the Property Trustee enforceable against
          it in accordance with its terms, subject to bankruptcy, insolvency,
          fraudulent transfer, reorganization, moratorium and similar laws of
          general applicability relating to or affecting creditors' rights and
          to general equity principles; and

               (iv)   the execution, delivery and performance by the Property
          Trustee of this Trust Agreement have been duly authorized by all
          necessary corporate or other action on the part of the Property
          Trustee and do not require any approval of stockholders of the
          Property Trustee and such execution, delivery and performance will not
          (a) violate the Property Trustee's charter or by-laws or (b) violate
          any law, governmental rule or regulation of the United States or the
          State of

                                      49

 
          New York, as the case may be, governing the banking, corporate, or
          trust powers of the Property Trustee, or any order, judgment or decree
          applicable to the Property Trustee.

          (b) The Delaware Trustee hereby represents and warrants for the
     benefit of the Depositor and the Securityholders that:

              (i)   the Delaware Trustee is a banking corporation duly
          organized, validly existing and in good standing under the laws of the
          State of Delaware;

              (ii)  the Delaware Trustee has full corporate power, authority and
          legal right to execute, deliver and perform its obligations under this
          Trust Agreement and has taken all necessary action to authorize the
          execution, delivery and performance by it of this Trust Agreement;

              (iii) this Trust Agreement has been duly authorized, executed and
          delivered by the Delaware Trustee and constitutes the valid and
          legally binding agreement of the Delaware Trustee enforceable against
          it in accordance with its terms, subject to bankruptcy, insolvency,
          fraudulent transfer, reorganization, moratorium and similar laws of
          general applicability relating to or affecting creditors' rights and
          to general equity principles; and

              (iv)  the execution, delivery and performance by the Delaware
          Trustee of this Trust Agreement have been duly authorized by all
          necessary corporate or other action on the part of the Delaware
          Trustee and do not require any approval of stockholders of the
          Delaware Trustee or the Delaware Trustee and such execution, delivery
          and performance will not (a) violate the Delaware Trustee's charter or
          by-laws or (b) violate any law, governmental rule or regulation of the
          United States or the State of Delaware, as the case may be, governing
          the banking, corporate, or trust powers of the Delaware Trustee, or
          any order, judgment or decree applicable to the Delaware Trustee.

                                      50

 
          SECTION 7.2.  Representations and Warranties of Depositor.  The
                        --------------------------------------------     
Depositor hereby represents and warrants for the benefit of the Property
Trustee, the Delaware Trustee and the Securityholders that:

          (a) the Trust Securities Certificates issued on the Closing Date on
     behalf of the Trust have been duly authorized and will have been duly and
     validly executed, issued and delivered by the Trustees pursuant to the
     terms and provisions of, and in accordance with the requirements of, this
     Trust Agreement and the Securityholders will be, as of such date, entitled
     to the benefits of this Trust Agreement; and

          (b) there are no taxes, fees or other governmental charges payable by
     the Trust (or the Trustees on behalf of the Trust) under the laws of the
     State of Delaware or any political subdivision thereof in connection with
     the execution, delivery and performance by the Property Trustee or the
     Delaware Trustee, as the case may be, of this Trust Agreement.


                                   ARTICLE 8
                                  THE TRUSTEES

          SECTION 8.1.  Certain Duties and Responsibilities. (a)  The duties and
                        ------------------------------------                    
responsibilities of the Trustees shall be as provided by this Trust Agreement
and, in the case of the Property Trustee, by the Trust Indenture Act.  The
Property Trustee, before the occurrence of any Event of Default and after the
curing or waiving of all Events of Default that may have occurred, shall
undertake to perform only such duties and obligations as are specifically set
forth in this Trust Agreement and the Trust Indenture Act and no implied
covenants shall be read into this Trust Agreement against the Property Trustee.
In case an Event of Default has occurred (that has not been cured or waived
pursuant to Section 8.2) of which a Responsible Officer of the Property Trustee
has actual knowledge, the Property Trustee shall exercise such rights and powers
vested in it by this Trust Agreement and the Trust Indenture Act, and use the
same degree of care and skill in its exercise, as a prudent individual would
exercise or use under the circumstances in the conduct of his or her own
affairs. Notwithstanding the foregoing, no provision of this Trust Agreement
shall require the Trustees to expend or risk their own funds or otherwise incur
any financial liability in the performance of any of their duties hereunder, or
in the exercise of any of their rights or powers, if they shall have reasonable
grounds for believing that repayment of such

                                      51

 
funds or adequate indemnity against such risk or liability is not reasonably
assured to it.  Whether or not therein expressly so provided, every provision of
this Trust Agreement relating to the conduct or affecting the liability of or
affording protection to the Trustees shall be subject to the provisions of this
Section.  Nothing in this Trust Agreement shall be construed to release the
Administrative Trustees from liability for their own grossly negligent action,
their own grossly negligent failure to act, or their own willful misconduct.  To
the extent that, at law or in equity, an Administrative Trustee has duties
(including fiduciary duties) and liabilities relating thereto to the Trust or to
the Securityholders, such Administrative Trustee shall not be liable to the
Trust or to any Securityholder for such Administrative Trustee's good faith
reliance on the provisions of this Trust Agreement.  The provisions of this
Trust Agreement, to the extent that they restrict the duties and liabilities of
the Administrative Trustees otherwise existing at law or in equity, are agreed
by the Depositor and the Securityholders to replace such other duties and
liabilities of the Administrative Trustees.

          (b)  All payments made by the Property Trustee or a Paying Agent in
respect of the Trust Securities shall be made only from the revenue and proceeds
from the Trust Property and only to the extent that there shall be sufficient
revenue or proceeds from the Trust Property to enable the Property Trustee or a
Paying Agent to make payments in accordance with the terms hereof.  Each
Securityholder, by its acceptance of a Trust Security, agrees that it will look
solely to the revenue and proceeds from the Trust Property to the extent legally
available for distribution to it as herein provided and that the Trustees are
not personally liable to it for any amount distributable in respect of any Trust
Security or for any other liability in respect of any Trust Security.  This
Section 8.1(b) does not limit the liability of the Trustees expressly set forth
elsewhere in this Trust Agreement or, in the case of the Property Trustee, in
the Trust Indenture Act.

          (c)  No provision of this Trust Agreement shall be construed to
relieve the Property Trustee from liability for its own negligent action, its
own negligent failure to act, or its own willful misconduct, except that:

          (i) the Property Trustee shall not be liable for any error of judgment
     made in good faith by an authorized officer of the Property Trustee, unless
     it shall be proved that the Property Trustee was negligent in ascertaining
     the pertinent facts;

                                      52

 
          (ii)   the Property Trustee shall not be liable with respect to any
     action taken or omitted to be taken by it in good faith in accordance with
     the direction of the Holders of a majority in aggregate Liquidation Amount
     of the Trust Securities relating to the time, method and place of
     conducting any proceeding for any remedy available to the Property Trustee,
     or exercising any trust or power conferred upon the Property Trustee under
     this Trust Agreement;

          (iii)  the Property Trustee's sole duty with respect to the custody,
     safekeeping and physical preservation of the Debentures and the Payment
     Account shall be to deal with such property as fiduciary assets, subject to
     the protections and limitations on liability afforded to the Property
     Trustee under this Trust Agreement and the Trust Indenture Act;

          (iv)   the Property Trustee shall not be liable for any interest on
     any money received by it except as it may otherwise agree, in writing, with
     the Depositor and money held by the Property Trustee need not be segregated
     from other funds held by it except in relation to the Payment Account
     maintained by the Property Trustee pursuant to Section 3.1 and except to
     the extent otherwise required by law;

          (v)    the Property Trustee shall not be responsible for monitoring
     the compliance by the Administrative Trustees or the Depositor with their
     respective duties under this Trust Agreement, nor shall the Property
     Trustee be liable for the default or misconduct of the Administrative
     Trustees or the Depositor;

          (vi)   the Property Trustee shall have no duty or liability with
     respect to the value, genuineness, existence or sufficiency of the
     Debentures or the payment of any taxes or assessments thereon or in
     connection therewith;

          (vii)  the duties and obligations of the Property Trustee shall be
     determined solely by the express provisions of this Trust Agreement and in
     the Preferred Securities and the Common Securities and the Property Trustee
     shall not be liable except for the performance of such duties and
     obligations as are specifically set forth in this Trust Agreement and in
     the Preferred Securities and the Common Securities, and no implied
     covenants or obligations shall be read into this Trust Agreement against
     the Property Trustee; and

                                      53

 
          (viii)  no provision of this Trust Agreement shall require the
     Property Trustee to expend or risk its own funds or otherwise incur
     personal financial liability in the performance of any of its duties or in
     the exercise of any of its rights or powers, if it shall have reasonable
     grounds for believing that the repayment of such funds or liability is not
     reasonably assured to it under the terms of this Trust Agreement or
     indemnity reasonably satisfactory to the Property Trustee against such risk
     or liability is not reasonably assured to it.

          SECTION 8.2.  Notice of Defaults.  (a)  Within ten days after the
                        -------------------                                
occurrence of any Event of Default actually known to a Responsible Officer of
the Property Trustee, the Property Trustee shall transmit, in the manner and to
the extent provided in Section 10.8, notice of such Event of Default to the
Holders of Preferred Securities, the Administrative Trustees and the Depositor,
unless such Event of Default shall have been cured or waived, provided that,
                                                              --------      
except for a default in the payment of principal of (or premium, if any) or
interest on any of the Debentures, the Property Trustee shall be fully protected
in withholding such notice if and so long as the Board of Directors, the
executive committee, or a trust committee of directors and/or Responsible
Officers of the Property Trustee in good faith determines that the withholding
of such notice is in the interests of the Holders of the Preferred Securities.

          (b)  Within ten days after the receipt of notice of the Depositor's
exercise of its right to extend the interest payment period for the Debentures
pursuant to the Indenture, the Property Trustee shall transmit, in the manner
and to the extent provided in Section 10.8, notice of such exercise to the
Securityholders, unless such exercise shall have been revoked.

          (c)  The Holders of a majority in Liquidation Amount of Preferred
Securities may, by vote, on behalf of the Holders of all of the Preferred
Securities, waive any past Event of Default in respect of the Preferred
Securities and its consequences, provided that, if the underlying Debenture
                                 --------                                  
Event of Default:

               (i)  is not waivable under the Indenture, the Event of Default
     under this Trust Agreement shall also not be waivable; or

               (ii) requires the consent or vote of greater than a majority in
     principal amount of the holders of the Debentures, including the consent or
     vote of all

                                      54

 
     such holders, (a "Super Majority") to be waived under the Indenture, the
     Event of Default under this Trust Agreement may only be waived by the vote
     of the Holders of the same proportion in Liquidation Amount of the
     Preferred Securities that the relevant Super Majority represents of the
     aggregate principal amount of the Debentures outstanding.

          The provisions of Section 6.1(b) and this Section 8.2(c) shall be in
lieu of (S) 316(a)(1)(B) of the Trust Indenture Act and such (S) 316(a)(1)(B) of
the Trust Indenture Act is hereby expressly excluded from this Trust Agreement
and the Preferred Securities, as permitted by the Trust Indenture Act.  Upon
such waiver, any such default shall cease to exist, and any Event of Default
with respect to the Preferred Securities arising therefrom shall be deemed to
have been cured, for every purpose of this Trust Agreement, but no such waiver
shall extend to any subsequent or other default or an Event of Default with
respect to the Preferred Securities or impair any right consequent thereon. Any
waiver by the Holders of the Preferred Securities of an Event of Default with
respect to the Preferred Securities shall also be deemed to constitute a waiver
by the Holders of the Common Securities of any such Event of Default with
respect to the Common Securities for all purposes of this Trust Agreement
without any further act, vote, or consent of the Holders of the Common
Securities.

          (d)  The Holders of a majority in Liquidation Amount of the Common
Securities may, by vote, on behalf of the Holders of all of the Common
Securities, waive any past Event of Default with respect to the Common
Securities and its consequences, provided that, if the underlying Debenture
                                 --------                                  
Event of Default:

               (i)   is not waivable under the Indenture, except where the
     Holders of the Common Securities are deemed to have waived such Event of
     Default under the Trust Agreement as provided below in this Section 8.2(d),
     the Event of Default under this Trust Agreement shall also not be waivable;
     or

               (ii)  requires the consent or vote of a Super Majority to be
     waived, except where the Holders of the Common Securities are deemed to
     have waived such Event of Default under this Trust Agreement as provided
     below in this Section 8.2(d), the Event of Default under this Trust
     Agreement may only be waived by the vote of the Holders of the same
     proportion in Liquidation Amount of the Common Securities that the relevant
     Super Majority

                                      55

 
     represents of the aggregate principal amount of the Debentures outstanding;

provided further, that each Holder of Common Securities will be deemed to have
waived any such Event of Default and all Events of Default with respect to the
Common Securities and its consequences until all Events of Default with respect
to the Preferred Securities have been cured, waived or otherwise eliminated, and
until such Events of Default have been so cured, waived or otherwise eliminated,
the Property Trustee will be deemed to be acting solely on behalf of the Holders
of the Preferred Securities and only the Holders of the Preferred Securities
will have the right to direct the Property Trustee in accordance with the terms
of the Securities.  The provisions of Section 6.1(b) and this Section 8.2(d)
shall be in lieu of (S) 316(a)(1)(B) of the Trust Indenture Act and such (S)
316(a)(1)(B) of the Trust Indenture Act is hereby expressly excluded from this
Trust Agreement and the Preferred Securities, as permitted by the Trust
Indenture Act.  Subject to the foregoing provisions of this Section 8.2(d), upon
such waiver, any such default shall cease to exist and any Event of Default with
respect to the Common Securities arising therefrom shall be deemed to have been
cured for every purpose of this Trust Agreement, but no such waiver shall extend
to any subsequent or other default or Event of Default with respect to the
Common Securities or impair any right consequent thereon.

          (e)  A waiver of a Debenture Event of Default by the Property Trustee
at the direction of the Holders of the Preferred Securities, constitutes a
waiver of the corresponding Event of Default under this Trust Agreement. The
foregoing provisions of this Section 8.2(e) shall be in lieu of (S) 316(a)(1)(B)
of the Trust Indenture Act and such (S) 316(a)(1)(B) of the Trust Indenture Act
is hereby expressly excluded from this Trust Agreement and the Preferred
Securities, as permitted by the Trust Indenture Act.

          SECTION 8.3.  Certain Rights of Property Trustee. Subject to the
                        -----------------------------------               
provisions of Section 8.1:

          (a)  the Property Trustee may conclusively rely and shall be fully
     protected in acting or refraining from acting in good faith upon any
     resolution, Opinion of Counsel, certificate, written representation of a
     Holder or transferee such as of a certificate presented for transfer,
     certificate of auditors or any other certificate, statement, instrument,
     opinion, report, notice, request, consent, order, appraisal, bond,
     debenture, note, other evidence of indebtedness or

                                      56

 
     other paper or document believed by it to be genuine and to have been
     signed or presented by the proper party or parties;

          (b) if no Event of Default has occurred and is continuing and, (i) in
     performing its duties under this Trust Agreement the Property Trustee is
     required to decide between alternative courses of action or (ii) in
     construing any of the provisions in this Trust Agreement the Property
     Trustee finds the same ambiguous or inconsistent with any other provisions
     contained herein or (iii) the Property Trustee is unsure of the application
     of any provision of this Trust Agreement, then, except as to any matter as
     to which the Holders of Preferred Securities are entitled to vote under the
     terms of this Trust Agreement, the Property Trustee shall deliver a notice
     to the Depositor requesting written instructions of the Depositor as to the
     course of action to be taken and the Property Trustee shall take such
     action, or refrain from taking such action, as the Property Trustee shall
     be instructed in writing to take, or to refrain from taking, by the
     Depositor; provided, however, that if the Property Trustee does not receive
                --------  -------                                               
     such instructions of the Depositor within ten Business Days after it has
     delivered such notice, or such reasonably shorter period of time set forth
     in such notice (which to the extent practicable shall not be less than two
     Business Days), it may, but shall be under no duty to, take or refrain from
     taking such action not inconsistent with this Trust Agreement as it shall
     deem advisable and in the best interests of the Securityholders, in which
     event the Property Trustee shall have no liability except for its own bad
     faith, negligence or willful misconduct;

          (c) any direction or act of the Depositor or the Administrative
     Trustees contemplated by this Trust Agreement shall be sufficiently
     evidenced by an Officers' Certificate;

          (d) whenever in the administration of this Trust Agreement, the
     Property Trustee shall deem it desirable that a matter be established
     before undertaking, suffering or omitting any action hereunder, the
     Property Trustee (unless other evidence is herein specifically prescribed)
     may, in the absence of bad faith on its part, request and conclusively rely
     upon an Officers' Certificate and an Opinion of Counsel which, upon receipt
     of such request, shall be promptly delivered by the Depositor or the
     Administrative Trustees;

                                      57

 
          (e) the Property Trustee shall have no duty to accomplish any
     recording, filing or registration of any instrument (including any
     financing or continuation statement or any filing under tax or securities
     laws) or any rerecording, refiling or reregistration thereof;

          (f) the Property Trustee may consult with counsel at the Depositor's
     expense (which counsel may be counsel to the Depositor or any of its
     Affiliates, and may include any of its employees) and the advice of such
     counsel or any Opinion of Counsel shall be full and complete authorization
     and protection in respect of any action taken, suffered or omitted by it
     hereunder in good faith and in reliance thereon and in accordance with such
     advice; and the Property Trustee shall have the right at any time to seek
     instructions concerning the administration of this Trust Agreement from any
     court of competent jurisdiction;

          (g) the Property Trustee shall be under no obligation to exercise any
     of the rights or powers vested in it by this Trust Agreement at the request
     or direction of any of the Securityholders pursuant to this Trust
     Agreement, unless such Securityholders shall have offered to the Property
     Trustee reasonable security or indemnity satisfactory to it against the
     costs, expenses (including attorneys' fees and expenses and the expenses of
     the Property Trustee's agents, custodians or nominees) and liabilities
     which might be incurred by it in compliance with such request or direction;

          (h) the Property Trustee shall not be bound to make any investigation
     into the facts or matters stated in any resolutions, certificate,
     statement, instrument, opinion, report, notice, request, consent, order,
     approval, bond, debenture, note or other evidence of indebtedness or other
     paper or document, but the Property Trustee may make such further inquiry
     or investigation into such facts or custodian or nominee matters as it may
     see fit;

          (i) the Property Trustee may execute any of the trusts or powers
     hereunder or perform any duties hereunder either directly or by or through
     its agents, custodians or nominees, attorneys or an Affiliate, provided
     that the Property Trustee shall not be responsible for the negligence or
     recklessness on the part of any agent, attorney, custodian or nominee
     appointed by it with due care hereunder;

                                      58

 
          (j) whenever in the administration of this Trust Agreement the
     Property Trustee shall deem it desirable to receive instructions with
     respect to enforcing any remedy or right or taking any other action
     hereunder, the Property Trustee (i) may request instructions from the
     Holders of the Trust Securities, which instructions may only be given by
     the Holders of the same proportion in Liquidation Amount of the Trust
     Securities as would be entitled to direct the Property Trustee under the
     terms of the Trust Securities in respect of such remedy, right or action,
     (ii) may refrain from enforcing such remedy or right or taking such other
     action until such instructions are received, and (iii) shall be fully
     protected in conclusively relying on or acting in accordance with such
     instructions;

          (k) except as otherwise expressly provided by this Trust Agreement,
     the Property Trustee shall not be under any obligation to take any action
     that is discretionary under the provisions of this Trust Agreement;

          (1) the Property Trustee shall not be liable for any action taken,
     suffered, or omitted to be taken by it in good faith and reasonably
     believed by it to be authorized or within the discretion or rights or
     powers conferred upon it by this Trust Agreement; and

          (m) in the event that the Property Trustee is also acting as a Paying
     Agent, Conversion Agent, and/or Securities Registrar hereunder, the rights
     and protections afforded to the Property Trustee pursuant to this Article 8
     shall also be afforded to such Paying Agent, Conversion Agent, and/or
     Securities Registrar.

          No provision of this Trust Agreement shall be deemed to impose any
duty or obligation on the Property Trustee to perform any act or acts or
exercise any right, power, duty or obligation conferred or imposed on it, in any
jurisdiction in which it shall be illegal, or in which the Property Trustee
shall be unqualified or incompetent in accordance with applicable law, to
perform any such act or acts, or to exercise any such right, power, duty or
obligation.  No permissive power or authority available to the Property Trustee
shall be construed to be a duty.

          Section 8.4.  Not Responsible for Recitals or Issuance of Securities.
                        ------------------------------------------------------- 
The recitals contained herein and in the Trust Securities Certificates shall not
be taken as the statements of the Trustees, and the Trustees do not assume any
responsibility for their correctness.  The

                                      59

 
Trustees shall not be accountable for the use or application by the Depositor of
the proceeds of the Debentures.

          SECTION 8.5.  May Hold Securities.  Except as provided in the
                        --------------------                           
definition of the term "Outstanding" in Article 1, any Trustee or any other
agent of any Trustee or the Trust, in its individual or any other capacity, may
become the owner or pledgee of Trust Securities and, subject to Section 8.8 and
8.12, may otherwise deal with the Trust with the same rights it would have if it
were not a Trustee or such other agent.

          SECTION 8.6.  Compensation; Indemnity; Fees.
                        ------------------------------

     The Depositor agrees:

          (a) to pay the Trustees from time to time reasonable compensation for
     all services rendered by them hereunder (which compensation shall not be
     limited by any provision of law in regard to the compensation of a trustee
     of an express trust);

          (b) except as otherwise expressly provided herein, to reimburse the
     Trustees upon request for all reasonable expenses, disbursements and
     advances incurred or made by the Trustees in accordance with any provision
     of this Trust Agreement (including the reasonable compensation and the
     expenses and disbursements of its agents and counsel), except any such
     expense, disbursement or advance as may be attributable to its negligence
     or bad faith;

          (c) to the fullest extent permitted by applicable law, to indemnify
     and hold harmless (i) each Trustee, (ii) any Affiliate of any Trustee,
     (iii) any officer, director, shareholder, employee, representative or agent
     of any Trustee, and (iv) any employee or agent of the Trust or its
     Affiliates (referred to herein as an "Indemnified Person") from and against
     any loss, damage, liability, tax, penalty, expense or claim of any kind or
     nature whatsoever incurred by such Indemnified Person by reason of the
     creation, operation, dissolution or termination of the Trust or in
     connection with the administration of the Trust or any act or omission
     performed or omitted by such Indemnified Person in good faith on behalf of
     the Trust and in a manner such Indemnified Person reasonably believed to be
     within the scope of authority conferred on such Indemnified Person by this
     Trust Agreement, except that no Indemnified Person shall be entitled to be
     indemnified in respect of any loss, damage or claim

                                      60

 
     incurred by such Indemnified Person by reason of negligence or willful
     misconduct with respect to such acts or omissions; and

          (d) no Trustee may claim any lien or charge on any Trust Property as a
     result of any amount due pursuant to this Section 8.6.

          SECTION 8.7.  Property Trustee Required; Eligibility of Trustees.  (a)
                        ---------------------------------------------------  
There shall at all times be a Property Trustee hereunder with respect to the
Trust Securities.  The Property Trustee shall be a Person that is eligible
pursuant to the Trust Indenture Act to act as such and has a combined capital
and surplus of at least $50,000,000.  If any such Person publishes reports of
condition at least annually, pursuant to law or to the requirements of its
supervising or examining authority, then for the purposes of this Section, the
combined capital and surplus of such Person shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published.  If at any time the Property Trustee with respect to the Trust
Securities shall cease to be eligible in accordance with the provisions of this
Section, it shall resign immediately in the manner and with the effect
hereinafter specified in this Article.

          (b)  There shall at all times be one or more Administrative Trustees
hereunder with respect to the Trust Securities. Each Administrative Trustee
shall be either a natural person who is at least 21 years of age or a legal
entity that shall act through one or more persons authorized to bind that
entity.

          (c)  There shall at all times be a Delaware Trustee with respect to
the Trust Securities.  The Delaware Trustee shall either be (i) a natural person
who is at least 21 years of age and a resident of the State of Delaware or (ii)
a legal entity with its principal place of business in the State of Delaware and
that otherwise meets the requirements of applicable Delaware law that shall act
through one or more persons authorized to bind such entity.

          SECTION 8.8.  Conflicting Interests.  If the Property Trustee has or
                        ----------------------                                
shall acquire a conflicting interest within the meaning of the Trust Indenture
Act, the Property Trustee shall either eliminate such interest or resign, to the
extent and in the manner provided by, and subject to the provisions of, the
Trust Indenture Act and this Trust Agreement.

                                      61

 
          SECTION 8.9.  Resignation and Removal; Appointment of Successor.  (a)
                        --------------------------------------------------      
Subject to Sections 8.9(b) and 8.9(c), Trustees (the "Relevant Trustee") may be
appointed or removed without cause at any time:

               (i)  until the issuance of any Trust Securities, by written
     instrument executed by the Depositor; and

               (ii) after the issuance of any Securities, by vote of the Holders
     of a majority in Liquidation Amount of the Common Securities voting as a
     class.

          (b)  The Trustee that acts as Property Trustee shall not be removed in
accordance with Section 8.9(a) until a successor possessing the qualifications
to act as a Property Trustee under Section 8.7 (a "Successor Property Trustee")
has been appointed and has accepted such appointment by instrument executed by
such Successor Property Trustee and delivered to the Trust, the Depositor and
the removed Property Trustee.

          (c)  The Trustee that acts as Delaware Trustee shall not be removed in
accordance with Section 8.9(a) until a successor possessing the qualifications
to act as Delaware Trustee under Section 8.7 (a "Successor Delaware Trustee")
has been appointed and has accepted such appointment by instrument executed by
such Successor Delaware Trustee and delivered to the Trust, the Depositor and
the removed Delaware Trustee.

          (d)  A Trustee appointed to office shall hold office until his, her or
its successor shall have been appointed or until his, her or its death, removal,
resignation, dissolution or liquidation.  Any Trustee may resign from office
(without need for prior or subsequent accounting) by an instrument in writing
signed by the Trustee and delivered to the Depositor and the Trust, which
resignation shall take effect upon such delivery or upon such later date as is
specified therein; provided, however, that:
                   --------  -------       

               (i) No such resignation of the Trustee that acts as the Property
     Trustee shall be effective:

                    (a) until a Successor Property Trustee has been appointed
          and has accepted such appointment by instrument executed by such
          Successor Property Trustee and delivered to the Trust, the Depositor
          and the resigning Property Trustee; or

                                      62

 
                    (b) until the assets of the Trust have been completely
          liquidated and the proceeds thereof distributed to the Holders of the
          Securities;

               (ii)  no such resignation of the Trustee that acts as the
     Delaware Trustee shall be effective until a Successor Delaware Trustee has
     been appointed and has accepted such appointment by instrument executed by
     such Successor Delaware Trustee and delivered to the Trust, the Depositor
     and the resigning Delaware Trustee; and

               (iii) no appointment of a successor Property Trustee or Delaware
     Trustee shall be effective until all fees, charges, and expenses of the
     retiring Property Trustee or retiring Delaware Trustee, as the case may be,
     have been paid.

          (e)  The Holders of the Common Securities shall use their best efforts
to promptly appoint a Successor Property Trustee or Successor Delaware Trustee,
as the case may be, if the Property Trustee or the Delaware Trustee delivers an
instrument of resignation in accordance with Section 8.9(d).

          (f)  If no Successor Property Trustee or Successor Delaware Trustee
shall have been appointed and accepted appointment as provided in this Section
8.9 within 60 days after delivery pursuant to this Section 8.9 of an instrument
of resignation or removal, the Property Trustee or Delaware Trustee resigning or
being removed, as applicable, may petition any court of competent jurisdiction
for appointment of a Successor Property Trustee or Successor Delaware Trustee.
Such court may thereupon, after prescribing such notice, if any, as it may deem
proper and prescribe, appoint a Successor Property Trustee or Successor Delaware
Trustee, as the case may be.

          (g)  No Property Trustee or Delaware Trustee shall be liable for the
acts or omissions to act of any Successor Property Trustee or Successor Delaware
Trustee, as the case may be.

          (h)  The Property Trustee shall give notice of each resignation and
each removal of a Trustee and each appointment of a successor Trustee to all
Securityholders in the manner provided in Section 10.8 and shall give notice to
the Depositor. Each notice shall include the name of the successor Relevant
Trustee and the address of its Corporate Trust Office if it is the Property
Trustee.

                                      63

 
          (i)  Notwithstanding the foregoing or any other provision of this
Trust Agreement, in the event any Administrative Trustee or a Delaware Trustee
who is a natural person dies or becomes, in the opinion of the Depositor,
incompetent or incapacitated, the vacancy created by such death, incompetence or
incapacity may be filled by (a) the unanimous act of the remaining
Administrative Trustees if there are at least two of them or (b) otherwise by
the Depositor (with the successor in each case being a Person who satisfies the
eligibility requirement for Administrative Trustees or the Delaware Trustee, as
the case may be, set forth in Section 8.7).

          The indemnity provided to a Trustee under Section 8.6 shall survive
any Trustee's resignation or removal or termination of this Trust Agreement.

          SECTION 8.10.  Acceptance of Appointment by Successor.  In case of the
                         ---------------------------------------                
appointment hereunder of a successor Relevant Trustee, the retiring Relevant
Trustee and each successor Relevant Trustee shall execute and deliver an
amendment hereto wherein each successor Relevant Trustee shall accept such
appointment and which (a) shall contain such provisions as shall be necessary or
desirable to transfer and confirm to, and to vest in, each successor Relevant
Trustee all the rights, powers, trusts and duties of the retiring Relevant
Trustee and (b) shall add to or change any of the provisions of this Trust
Agreement as shall be necessary to provide for or facilitate the administration
of the trusts hereunder by more than one Relevant Trustee, it being understood
that nothing herein or in such amendment shall constitute such Relevant Trustees
as co-trustees and upon the execution and delivery of such amendment the
resignation or removal of the retiring Relevant Trustee shall become effective
to the extent provided therein and each such successor Relevant Trustee, without
any further act, deed or conveyance, shall become vested with all the rights,
powers, trusts and duties of the retiring Relevant Trustee; but, on request of
the Trust or any successor Relevant Trustee, such retiring Relevant Trustee
shall duly assign, transfer and deliver to such successor Relevant Trustee all
Trust Property, all proceeds thereof and money held by such retiring Relevant
Trustee hereunder.

          Upon request of any such successor Relevant Trustee, the Trust shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Relevant Trustee all such rights, powers and trusts
referred to in the first or second preceding paragraph, as the case may be.

                                      64

 
          No successor Relevant Trustee shall accept its appointment unless at
the time of such acceptance such successor Relevant Trustee shall be qualified
and eligible under this Article.

          SECTION 8.11.  Merger, Conversion, Consolidation or Succession to
                         --------------------------------------------------
Business.  Any Person into which the Property Trustee, the Delaware Trustee or
- ---------                                                                     
any Administrative Trustee that is not a natural person may be merged or
converted or with which it may be consolidated, or any Person resulting from any
merger, conversion or consolidation to which such Relevant Trustee shall be a
party, or any corporation succeeding to all or substantially all the corporate
trust business of such Relevant Trustee, shall be the successor of such Relevant
Trustee hereunder, provided such Person shall be otherwise qualified and
eligible under this Article, without the execution or filing of any paper or any
further act on the part of any of the parties hereto.

          SECTION 8.12.  Preferential Collection of Claims Against Depositor or
                         ------------------------------------------------------
Trust.  If and when the Property Trustee shall be or become a creditor of the
- ------                                                                       
Depositor or the Trust (or any other obligor upon the Debentures or the Trust
Securities), the Property Trustee shall be subject to and shall take all actions
necessary in order to comply with the provisions of the Trust Indenture Act
regarding the collection of claims against the Depositor or Trust (or any such
other obligor).

          SECTION 8.13.  Reports by Property Trustee. Within 60 days after May
                         ----------------------------                         
15 of each year, commencing with the first May 15, after the first issuance of
Preferred Securities, the Property Trustee shall provide to the Holders of the
Preferred Securities such reports as are required by (S) 313 of the Trust
Indenture Act, if any, in the form and in the manner provided by (S) 313 of the
Trust Indenture Act.  The Property Trustee shall also comply with the
requirements of (S) 313(d) of the Trust Indenture Act.

          SECTION 8.14.  Reports to the Property Trustee. The Depositor and the
                         --------------------------------                      
Administrative Trustees on behalf of the Trust shall provide to the Property
Trustee such documents, reports and information as are required by Section 314
of the Trust Indenture Act (if any) and the compliance certificate required by
Section 314(a) of the Trust Indenture Act in the form, in the manner and at the
times required by Section 314 of the Trust Indenture Act.

          SECTION 8.15.  Evidence of Compliance with Conditions Precedent.  Each
                         -------------------------------------------------      
of the Depositor and the

                                      65

 
Administrative Trustees on behalf of the Trust shall provide to the Property
Trustee such evidence of compliance with any conditions precedent, if any,
provided for in this Trust Agreement that relate to any of the matters set forth
in Section 314(c) of the Trust Indenture Act.  Any certificate or opinion
required to be given by an officer pursuant to Section 314(c)(1) of the Trust
Indenture Act shall be given in the form of an Officers' Certificate.

          SECTION 8.16.  Number of Trustees.  (a) The number of Trustees shall
                         -------------------                                  
be five, provided that the Holder of all of the Common Securities by written
instrument may increase or decrease the number of Administrative Trustees.  The
Property Trustee and the Delaware Trustee may be the same Person.

          (b)  If a Trustee ceases to hold office for any reason and the number
of Administrative Trustees is not reduced pursuant to Section 8.16(a), or if the
number of Trustees is increased pursuant to Section 8.16(a), a vacancy shall
occur.

          (c)  The death, resignation, retirement, removal, bankruptcy,
incompetence or incapacity to perform the duties of a Trustee shall not operate
to dissolve, terminate or annul the Trust. Whenever a vacancy in the number of
Administrative Trustees shall occur, until such vacancy is filled by the
appointment of an Administrative Trustee in accordance with Section 8.9, the
Administrative Trustees in office, regardless of their number (and
notwithstanding any other provision of this Agreement), shall have all the
powers granted to the Administrative Trustees and shall discharge all the duties
imposed upon the Administrative Trustees by this Trust Agreement.

          SECTION 8.17.  Delegation of Power.  (a)  Any Administrative Trustee
                         --------------------                                 
may, by power of attorney consistent with applicable law, delegate to any other
natural person over the age of 21 his or her power for the purpose of executing
any documents contemplated in Section 2.7(a), including any registration
statement or amendment thereof filed with the Commission, or making any other
governmental filing.

          (b)  The Administrative Trustees shall have power to delegate from
time to time to such of their number or to the Depositor the doing of such
things and the execution of such instruments either in the name of the Trust or
the names of the Administrative Trustees or otherwise as the Administrative
Trustees may deem expedient, to the extent such delegation is not prohibited by
applicable law or

                                      66

 
contrary to the provisions of the Trust, as set forth herein.


                                   ARTICLE 9
                      DISSOLUTION, LIQUIDATION AND MERGER

          SECTION 9.1.  Dissolution upon Expiration Date. Unless earlier
                        ---------------------------------               
dissolved, the Trust shall automatically dissolve on [                ] (the
"Expiration Date").

          Section 9.2.  Early Dissolution.  The first to occur of any of the
                        ------------------                                  
following events is an "Early Dissolution Event":

          (a) the occurrence of a Bankruptcy Event in respect of, or the
dissolution or liquidation of, the Depositor;

          (b) the occurrence of a Special Event except in the case of a Tax
Event following which the Depositor has elected (i) to pay any Additional Sums
(in accordance with Section 4.4) such that the net amount received by Holders of
Preferred Securities in respect of Distributions are not reduced as a result of
such Tax Event and the Depositor has not revoked any such election or failed to
make such payments or (ii) to redeem all or some of the Debentures pursuant to
Section 4.4(a);

          (c) the redemption, conversion or exchange of all of the Trust
Securities;

          (d) an order for dissolution of the Trust shall have been entered by a
court of competent jurisdiction; and

          (e) receipt by the Property Trustee of written notice from the
Depositor at any time (which direction is optional and wholly within the
discretion of the Depositor) of its intention to dissolve the Trust and
distribute the Debentures in exchange for the Preferred Securities.

          SECTION 9.3.  Dissolution.  The respective obligations and
                        ------------                                
responsibilities of the Trustees and the Trust created and continued hereby
shall terminate upon the latest to occur of the following:  (a) the distribution
by the Property Trustee to Securityholders upon the liquidation of the Trust
pursuant to Section 9.4, or upon the redemption of all of the Trust Securities
pursuant to Section 4.2, of all amounts required to be distributed hereunder
upon the final payment of the Trust Securities; (b) the payment of all expenses
owed by the Trust; and (c) the discharge of all

                                      67

 
administrative duties of the Administrative Trustees, including the performance
of any tax reporting obligations with respect to the Trust or the
Securityholders.

          SECTION 9.4.  Liquidation.  (a)  If an Early Dissolution Event
                        ------------                                    
specified in clause (a), (b), (d) or (e) of Section 9.2 occurs or upon the
Expiration Date, the Trust shall be liquidated by the Trustees as expeditiously
as the Trustees determine to be possible by distributing, after satisfaction of
liabilities to creditors of the Trust as provided by applicable law, to each
Securityholder an aggregate principal amount of Debentures equal to the
aggregate Liquidation Amount of Trust Securities held by such Holder, subject to
Section 9.4(d). Notice of liquidation shall be given by the Property Trustee by
first-class mail, postage prepaid, mailed not later than 30 nor more than 60
days prior to the Liquidation Date to each Holder of Trust Securities at such
Holder's address as it appears in the Securities Register. All notices of
liquidation shall be prepared by the Administrative Trustees and shall:

          (i) state the Liquidation Date;

          (ii) state that, from and after the Liquidation Date, the Trust
     Securities will no longer be deemed to be Outstanding and any Trust
     Securities Certificates not surrendered for exchange will be deemed to
     represent an aggregate principal amount of Debentures equal to the
     aggregate Liquidation Amount of Preferred Securities held by such Holder;
     and

          (iii) provide such information with respect to the mechanics by which
     Holders may exchange Trust Securities Certificates for Debentures, or, if
     Section 9.4(d) applies, receive a Liquidation Distribution, as the
     Administrative Trustees or the Property Trustee shall deem appropriate.

          (b) Except where Section 9.2(c) or 9.4(d) applies, in order to effect
the liquidation of the Trust and distribution of the Debentures to
Securityholders, the Property Trustee shall establish a record date for such
distribution (which shall be not more than 45 days prior to the Liquidation Date
and, unless the Property Trustee determines otherwise, shall be the date which
is the fifteenth day (whether or not a Business Day) next preceding the
Liquidation Date) and, either itself acting as exchange agent or through the
appointment of a separate exchange agent, shall establish such procedures as it
shall deem

                                      68

 
appropriate to effect the distribution of Debentures in exchange for the
Outstanding Trust Securities Certificates.

          (c) Except where Section 9.2(c) or 9.4(d) applies, after the
Liquidation Date, (i) the Trust Securities will no longer be deemed to be
Outstanding, (ii) the Clearing Agency or its nominee, as the record holder of
such Trust Securities, will receive a registered global certificate or
certificates representing the Debentures to be delivered upon such distribution
and (iii) any Trust Securities Certificates not held by the Clearing Agency will
be deemed to represent an aggregate principal amount of Debentures equal to the
aggregate Liquidation Amount of Preferred Securities held by such Holders, and
bearing accrued and unpaid interest in an amount equal to the accrued and unpaid
Distributions on such Trust Securities until such certificates are presented to
the Property Trustee for transfer or reissuance.

          (d) In the event that, notwithstanding the other provisions of this
Section 9.4, whether because of an order for dissolution entered by a court of
competent jurisdiction or otherwise, distribution of the Debentures in the
manner provided herein is determined by the Property Trustee not to be
practicable, the Trust Property shall be liquidated, and the Trust shall be
wound-up or terminated, by the Property Trustee in such manner as the Property
Trustee determines, and an Administrative Trustee shall prepare, execute and
file the certificate of cancellation with the Secretary of State of the State of
Delaware. In such event, Securityholders will be entitled to receive out of the
assets of the Trust available for distribution to Securityholders, after
satisfaction of liabilities to creditors of the Trust as provided by applicable
law, an amount equal to the Liquidation Amount per Trust Security plus accrued
and unpaid Distributions thereon to the date of payment (such amount being the
"Liquidation Distribution"). If, upon any such winding-up or termination, the
Liquidation Distribution can be paid only in part because the Trust has
insufficient assets available to pay in full the aggregate Liquidation
Distribution, then, subject to the next succeeding sentence, the amounts payable
by the Trust on the Trust Securities shall be paid on a pro rata basis (based
                                                        --------             
upon Liquidation Amounts).  The Holder of the Common Securities will be entitled
to receive Liquidation Distributions upon any such winding-up or termination pro
                                                                             ---
rata (determined as aforesaid) with Holders of Preferred Securities, except
- ----                                                                       
that, if a Debenture Event of Default has occurred and is continuing, the
Preferred Securities shall have a priority over the Common Securities.

                                      69

 
          SECTION 9.5.  Mergers, Consolidations, Amalgamations or Replacements
                        ------------------------------------------------------
of the Trust.  The Trust may not merge with or into, consolidate, amalgamate, or
- -------------                                                                   
be replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to any Person, except pursuant to this Section 9.5
or Section 9.4. At the request of the Depositor, with the consent of the
Administrative Trustees and without the consent of the Property Trustee, the
Delaware Trustee or the Holders of the Preferred Securities, the Trust may merge
with or into, consolidate, amalgamate, be replaced by or convey, transfer or
lease its properties and assets substantially as an entirety to a trust
organized as such under the laws of any State; provided, that (i) such successor
entity either (a) expressly assumes all of the obligations of the Trust with
respect to the Preferred Securities or (b) substitutes for the Preferred
Securities other securities having substantially the same terms as the Preferred
Securities (the "Successor Securities") so long as the Successor Securities rank
the same as the Preferred Securities rank in priority with respect to
Distributions and payments upon liquidation, redemption and otherwise, (ii) the
Depositor expressly appoints a trustee of such successor entity possessing the
same powers and duties as the Property Trustee as the holder of the Debentures,
(iii) the Successor Securities are listed, or any Successor Securities will be
listed upon notification of issuance, on any national securities exchange or
other organization on which the Preferred Securities are then listed, if any,
(iv) such merger, consolidation, amalgamation, replacement, conveyance, transfer
or lease does not cause the Preferred Securities (including any Successor
Securities) to be downgraded by any nationally recognized statistical rating
organization, (v) such merger, consolidation, amalgamation, replacement,
conveyance, transfer or lease does not adversely affect the rights, preferences
and privileges of the Holders of the Preferred Securities (including any
Successor Securities) in any material respect (other than with respect to any
dilution of the Holder's interest in the new entity), (vi) such successor entity
has a purpose substantially identical to that of the Trust, (vii) prior to such
merger, consolidation, amalgamation, replacement, conveyance, transfer or lease
the Depositor has received an Opinion of Counsel to the effect that (a) such
merger, consolidation, amalgamation, replacement, conveyance, transfer or lease
does not adversely affect the rights, preferences and privileges of the Holders
of the Preferred Securities (including any Successor Securities) in any material
respect (other than with respect to any dilution of the Holder's interest in the
new entity), (b) following such merger, consolidation, amalgamation,
replacement,

                                      70

 
conveyance, transfer or lease neither the Trust nor such successor entity will
be required to register as an investment company under the 1940 Act, and (c)
following such merger, consolidation, amalgamation or replacement, the Trust or
such successor entity will be treated as a grantor trust for United States
Federal income tax purposes and (viii) the Depositor or any permitted successor
or assignee owns, directly or indirectly, all of the common securities of such
successor entity and guarantees the obligations of such successor entity under
the Successor Securities at least to the extent provided by the Guarantee.
Notwithstanding the foregoing, the Trust shall not, except with the consent of
Holders of 100% in aggregate Liquidation Amount of the Preferred Securities,
consolidate, amalgamate, merge with or into, be replaced by or convey, transfer
or lease its properties and assets substantially as an entirety to any other
entity or permit any other entity to consolidate, amalgamate, merge with or
into, or replace it if such consolidation, amalgamation, merger, replacement,
conveyance, transfer or lease would cause the Trust or the successor entity to
be classified as other than a grantor trust for United States Federal income tax
purposes.


                                  ARTICLE 10
                           MISCELLANEOUS PROVISIONS

          SECTION 10.1.  Limitation of Rights of Securityholders. Other than as
                         ----------------------------------------              
set forth in Section 9.1, the death, incapacity, dissolution, bankruptcy or
termination of any Person having an interest, beneficial or otherwise, in Trust
Securities shall not operate to dissolve the Trust or terminate this Trust
Agreement, nor entitle the legal representatives or heirs of such Person or any
Securityholder for such Person to claim an accounting, take any action or bring
any proceeding in any court for a partition or winding-up of the arrangements
contemplated hereby, nor otherwise affect the rights, obligations and
liabilities of the parties hereto or any of them.

          SECTION 10.2.  Amendment.  (a)  This Trust Agreement may be amended
                         ----------                                          
from time to time by the Trustees and the Depositor, without the consent of any
Securityholders, (i) to cure any ambiguity, correct or supplement any provision
herein which may be inconsistent with any other provision herein, or to make any
other provisions with respect to matters or questions arising under this Trust
Agreement, which shall not be inconsistent with the other provisions of this
Trust Agreement, (ii) to modify, eliminate or add to any provisions of this
Trust Agreement to such extent as shall be necessary to ensure

                                      71

 
that the Trust will be classified for United States Federal income tax purposes
as a grantor trust at all times that any Trust Securities are Outstanding or to
ensure that the Trust will not be required to register as an "investment
company" under the 1940 Act, or be classified as other than a grantor trust for
United States Federal income tax purposes, or (iii) to comply with the
requirements of the Commission in order to effect or maintain the qualification
of this Trust Agreement under the Trust Indenture Act; provided, however, that
                                                       --------  -------      
in the case of clause (i), such action shall not adversely affect in any
material respect the interests of any Securityholder, and any such amendments of
this Trust Agreement shall become effective when notice thereof is given to the
Securityholders.

          (b)  Except as provided in Section 10.2(c) hereof, any provision of
this Trust Agreement may be amended by the Trustees and the Depositor with (i)
the consent of Holders representing not less than a majority (based upon
Liquidation Amounts) of the Trust Securities then Outstanding, acting as a
single class, and (ii) receipt by the Trustees of an Opinion of Counsel to the
effect that such amendment or the exercise of any power granted to the Trustees
in accordance with such amendment will not affect the Trust's status as a
grantor trust for United States Federal income tax purposes or the Trust's
exemption from the status of an "investment company" under the 1940 Act,
provided, however, if any amendment or proposal that would adversely affect the
- --------  -------                                                              
powers, preferences or special rights of the Trust Securities, whether by way of
amendment or otherwise, would adversely affect only the Preferred Securities or
only the Common Securities, then only the affected class will be entitled to
vote on such amendment or proposal and such amendment or proposal shall not be
effective except with the approval of a majority in Liquidation Amount of such
class of Trust Securities.

          (c)  In addition to and notwithstanding any other provision in this
Trust Agreement, without the consent of each affected Securityholder (such
consent being obtained in accordance with Section 6.3 or 6.6 hereof), this Trust
Agreement may not be amended to (i) change the amount or timing of any
Distribution on the Trust Securities or otherwise adversely affect the amount of
any Distribution required to be made in respect of the Trust Securities as of a
specified date or (ii) restrict the right of a Securityholder to institute suit
for the enforcement of any such payment on or after such date; notwithstanding
any other provision herein, without the unanimous consent of the Securityholders
(such consent being obtained in accordance

                                      72

 
with Section 6.3 or 6.6 hereof), this paragraph (c) of this Section 10.2 may not
be amended.

          (d)  Notwithstanding any other provisions of this Trust Agreement, no
Trustee shall enter into or consent to any amendment to this Trust Agreement
which would cause the Trust to fail or cease to qualify for the exemption from
the status of an "investment company" under the 1940 Act or be classified as
other than a grantor trust for United States Federal income tax purposes.

          (e)  Notwithstanding anything in this Trust Agreement to the contrary,
without the consent of the Depositor, this Trust Agreement may not be amended in
a manner which imposes any additional obligation on the Depositor.

          (f)  In the event that any amendment to this Trust Agreement is made,
the Administrative Trustees shall promptly provide to the Depositor a copy of
such amendment.

          (g)  Neither the Property Trustee nor the Delaware Trustee shall be
required to enter into any amendment to this Trust Agreement which affects its
own rights, duties or immunities under this Trust Agreement. The Property
Trustee shall be entitled to receive an Opinion of Counsel and an Officers'
Certificate stating that any amendment to this Trust Agreement is in compliance
with this Trust Agreement and that all conditions precedent, if any, in this
Trust Agreement to the execution and delivery of such amendment have been
satisfied.

          SECTION 10.3.  Separability.  In case any provision in this Trust
                         -------------                                     
Agreement or in the Trust Securities Certificates shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

          SECTION 10.4.  Governing Law.  THIS TRUST AGREEMENT AND THE RIGHTS AND
                         --------------                                         
OBLIGATIONS OF EACH OF THE SECURITYHOLDERS, THE TRUST AND TRUSTEES WITH RESPECT
TO THIS TRUST AGREEMENT AND  THE TRUST SECURITIES SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF DELAWARE WITHOUT REGARD
TO ITS CONFLICT OF LAWS PRINCIPLES AND EXCLUDING SECTIONS 3540 AND 3561 OF TITLE
12 THEREOF.

          SECTION 10.5.  Payments Due on Non-Business Day. If the date fixed for
                         ---------------------------------                      
any payment on any Trust Security shall be a day which is not a Business Day,
then such payment need not be made on such date but may be made on the

                                      73

 
next succeeding day which is a Business Day except as otherwise provided in
Section 4.1 (a) and Section 4.2(d), with the same force and effect as though
made on the date fixed for such payment, and no interest shall accrue thereon
for the period after such date.

          SECTION 10.6.  Successors.  This Trust Agreement shall be binding upon
                         -----------                                            
and shall inure to the benefit of any successor to the Depositor, the Trust or
the Relevant Trustee, including any successor by operation of law. Except in
connection with a transaction that is permitted under Article 8 of the Indenture
and pursuant to which the assignee agrees in writing to perform the Depositor's
obligations hereunder, the Depositor shall not assign its obligations hereunder.

          SECTION 10.7.  Headings.  The Article and Section headings are for
                         ---------                                          
convenience only and shall not affect the construction of this Trust Agreement.

          SECTION 10.8.  Reports, Notices and Demands.  Any report, notice,
                         -----------------------------                     
demand or other communication which by any provision of this Trust Agreement is
required or permitted to be given or served to or upon any Securityholder or the
Depositor may be given or served in writing by deposit thereof, first-class
postage prepaid, in the United States mail, hand delivery or facsimile
transmission, in each case, addressed, (a) in the case of a Holder of Preferred
Securities, to such Holder as such Holder's name and address may appear on the
Securities Register; and (b) in the case of the Holder of the Common Securities,
to Aluminum Company of America, 201 Isabella Street, Pittsburgh, PA 15212-5858.

          Any notice, demand or other communication which by any provision of
this Trust Agreement is required or permitted to be given or served to or upon
the Trust, the Property Trustee, the Delaware Trustee or the Administrative
Trustees shall be given in writing addressed (until another address is published
by the Trust) as follows:  (a) with respect to the Property Trustee, to [The
Chase Manhattan Bank], [                         ], Attention:                ],
(b) with respect to the Delaware Trustee, to Chase Manhattan Bank Delaware, 
[           ], Delaware [     ], with a copy of any such notice to the Property
Trustee at its address above, and (c) with respect to the Administrative
Trustees, to them at the address for notices to the Depositor, marked
"Attention: [     ]. Such notice, demand or other communication to or upon the
Trust or the Property Trustee shall be deemed to have been sufficiently given or
made only

                                      74

 
upon actual receipt of the writing by the Trust or the Property Trustee.

          SECTION 10.9.   Agreement Not to Petition.  Each of the Trustees and
                          --------------------------                          
the Depositor agrees for the benefit of the Securityholders that, until at least
one year and one day after the Trust has been dissolved in accordance with
Article 9, it shall not file, or join in the filing of, a petition against the
Trust under any bankruptcy, insolvency, reorganization or other similar law
(including, without limitation, the United States Bankruptcy Code)
(collectively, "Bankruptcy Laws") or otherwise join in the commencement of any
proceeding against the Trust under any Bankruptcy Law. In the event the
Depositor takes action in violation of this Section 10.9, the Property Trustee
agrees, for the benefit of Securityholders, that, at the expense of the
Depositor, it shall file an answer with the bankruptcy court or otherwise
properly contest the filing of such petition by the Depositor against the Trust
or the commencement of such action and raise the defense that the Depositor has
agreed in writing not to take such action and should be stopped and precluded
therefrom and such other defenses, if any, as counsel for the Trustee or the
Trust may assert. The provisions of this Section 10.9 shall survive the
dissolution of this Trust Agreement.

          SECTION 10.10.  Trust Indenture Act; Conflict with Trust Indenture
                          --------------------------------------------------
Act.  (a)  This Trust Agreement is subject to the provisions of the Trust
- ----                                                                     
Indenture Act that are required to be part of this Trust Agreement and shall, to
the extent applicable, be governed by such provisions.

          (b)  The Property Trustee shall be the only Trustee which is the
trustee for the purposes of the Trust Indenture Act.

          (c)  If any provision hereof limits, qualifies or conflicts with
another provision hereof which is required to be included in this Trust
Agreement by any of the provisions of the Trust Indenture Act, such required
provision shall control. If any provision of this Trust Agreement modifies or
excludes any provision of the Trust Indenture Act which may be so modified or
excluded, the latter provision shall be deemed to apply to this Trust Agreement
as so modified or to be excluded, as the case may be.

          (d)  The application of the Trust Indenture Act to this Trust
Agreement shall not affect the nature of the Trust Securities as equity
securities representing undivided beneficial interests in the assets of the
Trust.

                                      75

 
          SECTION 10.11.  Acceptance of Terms of Trust Agreement, Guarantee and
                          -----------------------------------------------------
Indenture.  THE RECEIPT AND ACCEPTANCE OF A TRUST SECURITY OR ANY INTEREST
- ----------                                                                
THEREIN BY OR ON BEHALF OF A SECURITYHOLDER OR BENEFICIAL OWNER, WITHOUT ANY
SIGNATURE OR FURTHER MANIFESTATION OF ASSENT, SHALL CONSTITUTE THE UNCONDITIONAL
ACCEPTANCE BY THE SECURITYHOLDER AND ALL OTHERS HAVING A BENEFICIAL INTEREST IN
SUCH TRUST SECURITY OF ALL THE TERMS AND PROVISIONS OF THIS TRUST AGREEMENT AND
AGREEMENT TO SUBORDINATION PROVISIONS AND OTHER TERMS OF THE GUARANTEE AND THE
INDENTURE, AND SHALL CONSTITUTE THE AGREEMENT OF THE TRUST, SUCH SECURITYHOLDER
AND SUCH OTHERS THAT THE TERMS AND PROVISIONS OF THIS TRUST AGREEMENT SHALL BE
BINDING, OPERATIVE AND EFFECTIVE AS THE AGREEMENT OF THE TRUST AND SUCH
SECURITYHOLDER AND SUCH OTHERS.

          SECTION 10. 12.  Counterparts.  This Trust Agreement may contain more
                           -------------                                       
than one counterpart of the signature page and this Trust Agreement may be
executed by the affixing of the signature of each of the Trustees to one of such
counterpart signature pages.  All of such counterpart signature pages shall be
read as though one, and they shall have the same force and effect as though all
of the signers had signed a single signature page.

                                      76

 
          IN WITNESS WHEREOF, the parties hereto have caused this Trust
Agreement to be duly executed as of the day and year first above written.

                                   ALUMINUM COMPANY OF AMERICA,
                                   as Depositor

                                   By: ____________________________________
                                   Name: __________________________________
                                   Title: _________________________________


                                   THE CHASE MANHATTAN BANK,
                                   as Property Trustee

                                   By:_____________________________________
                                   Name: __________________________________
                                   Title: _________________________________


                                   CHASE MANHATTAN BANK DELAWARE,
                                   as Delaware Trustee

                                   By: ____________________________________
                                   Name: __________________________________
                                   Title: _________________________________


                                   ________________________________________
                                   [                  ],
                                   as Administrative Trustee

                                   ________________________________________
                                   [                 ],
                                   as Administrative Trustee

                                   ________________________________________
                                   [               ],
                                   as Administrative Trustee

                                      77

 
                                             EXHIBIT A - Certificate of Trust of
                                                                   Alcoa Trust I


                              CERTIFICATE OF TRUST

                                       OF

                                 ALCOA TRUST I


          THIS Certificate of Trust of Alcoa Trust I (the "Trust"), dated as of
[                 ], is being duly executed and filed by the undersigned, as
trustees, to form a business trust under the Delaware Business Trust Act (12
Del. C. (S)3801 et seq.).
- ---- --         -------  

          1.  Name. The name of the business trust formed hereby is Alcoa Trust
              -----  
[ ].

          2.  Delaware Trustee.  The name and business address of the trustee of
              -----------------                                                 
the Trust with a principal place of business in the State of Delaware are [
], Delaware [     ].

          3.  Effective Date. This Certificate of Trust shall be effective upon
              ---------------
filing.     

     IN WITNESS WHEREOF, the undersigned, being the trustees of the Trust, have
executed this Certificate of Trust as of the date first-above written.


                                        [                         ], not in
                                        its individual capacity but solely as
                                        trustee of the Trust
 
 
                                        By: ____________________________________
                                        Name:
                                        Title:


                                        [                   ], not in his
                                        individual capacity but solely as
                                        trustee of the Trust
                                         
                                        ________________________________________

                                      A-1

 
                                                 EXHIBIT B - Form of Certificate
                                                            Depositary Agreement

                                                             [Attach DTC Letter]

                                      B-1

 
                                        EXHIBIT C - Form of Common Securities of
                                                                   Alcoa Trust I


                     THIS CERTIFICATE IS NOT TRANSFERABLE 
                     EXCEPT TO AN ENTITY WHOLLY OWNED BY 
                     ALUMINUM COMPANY OF AMERICA OR TO 
                     CERTAIN SUCCESSORS OF ALUMINUM COMPANY 
                     OF AMERICA

          Certificate Number _____   Number of Common Securities ___

                   Certificate Evidencing Common Securities
                                      of
                                 Alcoa Trust I

                               Common Securities
                 (Liquidation Amount $50 per Common Security)

           Alcoa Trust I, a statutory business trust created under the laws of
the State of Delaware (the "Trust"), hereby certifies that Aluminum Company of
America (the "Holder") is the registered owner of ________ common securities of
the Trust representing undivided beneficial interests in the assets of the Trust
(the "Common Securities"). Except as set forth in Section 5.10 of the Trust
Agreement (as defined below), the Common Securities are not transferable and any
attempted transfer hereof shall be void. The designations, rights, privileges,
restrictions, preferences and other terms and provisions of the Common
Securities are set forth in, and this certificate and the Common Securities
represented hereby are issued and shall in all respects be subject to the terms
and provisions of, the Amended and Restated Trust Agreement of the Trust dated
as of [         ,    ], as the same may be amended from time to time (the "Trust
Agreement") including the designation of the terms of the Common Securities as
set forth therein. [The Holder is entitled to the benefits of the Common
Securities Guarantee Agreement entered into by Aluminum Company of America, a
Pennsylvania corporation, and The Chase Manhattan Bank, as Guarantee Trustee,
dated as of [          ,    ] (the "Guarantee"), to the extent provided
therein.] The Trust will furnish a copy of the Trust Agreement and the Guarantee
to the Holder without charge upon written request to the Trust at its principal
place of business or registered office.

           Upon receipt of this certificate, the Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

                                      C-1

 
          IN WITNESS WHEREOF, one of the Administrative Trustees of the Trust
has executed this certificate.

Dated:                             ALCOA TRUST I



                                   By: ______________________________________
                                   Name:   __________________________________
                                           As Administrative Trustee


                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Common Securities referred to in the within-
mentioned Trust Agreement.



                                   THE CHASE MANHATTAN BANK,
                                   as Property Trustee


                                      _____________________________________  
                                              Authorized Signatory

                                      C-2

 
                                     EXHIBIT D - Form of Preferred Securities of
                                                                   Alcoa Trust I


          [IF THE PREFERRED SECURITY IS TO BE A GLOBAL CERTIFICATE, INSERT -
This Preferred Security is a Book-Entry Preferred Securities Certificate within
the meaning of the Trust Agreement hereinafter referred to and is registered in
the name of The Depository Trust Company ("DTC") or a nominee of DTC.  This
Preferred Security is exchangeable for Preferred Securities registered in the
name of a person other than DTC or its nominee only in the limited circumstances
described in the Trust Agreement and no transfer of this Preferred Security
(other than a transfer of this Preferred Security as a whole by DTC to a nominee
of DTC or by a nominee of DTC to DTC or another nominee of DTC) may be
registered except in limited circumstances.

          Unless this certificate is presented by an authorized representative
of The Depository Trust Company, a New York corporation ("DTC"), to Issuer or
its agent for registration of transfer, exchange or payment, and any certificate
issued is registered in the name of Cede & Co. or in such other name as is
requested by an authorized representative of DTC (and any payment is made to
Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.]

                                      D-1

 
       Certificate Number ____      Number of Preferred Securities ____

                             CUSIP NO. ___________

                  CERTIFICATE EVIDENCING PREFERRED SECURITIES
                                       OF
                                ALCOA TRUST [  ]

                     ___% Convertible Preferred Securities
                (Liquidation Amount $50 per Preferred Security)

          Alcoa Trust [  ], a statutory business trust created under the laws of
the State of Delaware (the "Trust"), hereby certifies that ______________ (the
"Holder") is the registered owner of __________ preferred securities of the
Trust representing an undivided beneficial interest in the assets of the Trust
and designated the Alcoa Trust [  ] ___% Convertible Preferred Securities
(Liquidation Amount $50 per Preferred Security) (the "Preferred Securities").
Except to the extent set forth in the Trust Agreement (as defined below), the
Preferred Securities are transferable on the books and records of the Trust, in
person or by a duly authorized attorney, upon surrender of this certificate duly
endorsed and in proper form for transfer as provided in Section 5.4 of the Trust
Agreement (as defined below).  The designations, rights, privileges,
restrictions, preferences and other terms and provisions of the Preferred
Securities are set forth in, and this certificate and the Preferred Securities
represented hereby are issued and shall in all respects be subject to the terms
and provisions of, the Amended and Restated Trust Agreement of the Trust dated
as of [                     ] as the same may be amended from time to time (the
"Trust Agreement") including the designation of the terms of Preferred
Securities as set forth therein.  The Holder is entitled to the benefits of the
Guarantee Agreement entered into by Aluminum Company of America, a Pennsylvania
corporation, and The Chase Manhattan Bank, as Guarantee Trustee, dated as of [
] (the "Guarantee"), to the extent provided therein.  The Trust will furnish a
copy of the Trust Agreement and the Guarantee to the Holder without charge upon
written request to the Trust at its principal place of business or registered
office.

          Upon receipt of this certificate, the Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

                                      D-2

 
          IN WITNESS WHEREOF, one of the Administrative Trustees of the Trust
has executed this certificate.


Dated:                                       ALCOA TRUST I
 
                                             By: ______________________________
                                             Name:_____________________________
                                                  An Administrative Trustee


                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Preferred Securities referred to in the within-
mentioned Trust Agreement.



                                             THE CHASE MANHATTAN BANK,
                                             as Property Trustee
 
                                             By:  ______________________________
                                                       Authorized Signatory

                                      D-3

 
                                   ASSIGNMENT

     FOR VALUE RECEIVED, the undersigned assigns and transfers this Preferred
Security to:

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________
(Insert assignee's social security or tax identification number)

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________
(Insert address and zip code of assignee)

and irrevocably appoints

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

agent to transfer this Preferred Securities Certificate on the books of the
Trust.  The agent may substitute another to act for him or her.

Date:       ______________________

Signature:  ______________________

(Sign exactly as your name appears on the other side of this Preferred
Securities Certificate)

                                      D-4

 
                    [TO BE ATTACHED TO GLOBAL CERTIFICATE]

                                  SCHEDULE A

          The initial Liquidation Amount of this Global Certificate shall be
$_________.  The following increases or decreases in the Liquidation Amount of
this Global Certificate have been made:



======================================================================
         Amount of                                           
         increase in                                          
         Liquidation                                          
         Amount of                                           
         this Global                      Liquidation               
         Certificate                      Amount of       Signature  
         including       Amount of        this Global     of      
         upon            decrease in      Certificate     authorized  
         exercise of     Liquidation      following       officer of  
         over-           Amount of        such            Trustee or  
Date     allotment       this Global      decrease or     Securities  
Made     option          Certificate      increase        Custodian  
- ----------------------------------------------------------------------
                                              
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------
 
- ----------------------------------------------------------------------

======================================================================


                                      D-5

 
                                                EXHIBIT E - Notice of Conversion

                             NOTICE OF CONVERSION

To:  The Chase Manhattan Bank,
     as Property Trustee of
     Alcoa Trust I

          The undersigned owner of these Preferred Securities hereby irrevocably
exercises the option to convert these Preferred Securities, or the portion below
designated, into Common Stock of Aluminum Company of America (the "Alcoa Common
Stock") in accordance with the terms of the Amended and Restated Trust Agreement
(as amended from time to time, the "Trust Agreement"), dated as of [ ], by
____________, ____________ and ____________, as Administrative Trustees, Chase
Manhattan Bank Delaware, as Delaware Trustee, The Chase Manhattan Bank, as
Property Trustee, Aluminum Company of America, as Depositor, and by the Holders,
from time to time, of undivided beneficial interests in the assets of the Trust
to be issued pursuant to the Trust Agreement. Pursuant to the aforementioned
exercise of the option to convert these Preferred Securities, the undersigned
hereby directs the Conversion Agent (as that term is defined in the Trust
Agreement) to (i) exchange such Preferred Securities for a portion of the
Debentures (as that term is defined in the Trust Agreement) held by the Trust
(at the rate of exchange specified in the terms of the Preferred Securities set
forth in the Trust Agreement) and (ii) promptly convert such Debentures on
behalf of the undersigned, into Alcoa Common Stock (at the conversion rate
specified in the terms of the Preferred Securities set forth in the Trust
Agreement).

          The undersigned does also hereby direct the Conversion Agent that the
shares issuable and deliverable upon conversion, together with any check in
payment for fractional shares, be issued in the name of and delivered to the
undersigned, unless a different name has been indicated in the assignment below.
If shares are to be issued in the name of a person other than the undersigned,
the undersigned will pay all transfer taxes payable with respect thereto.

                                      E-1

 
Date: ____________
 
      in whole ___                      in part ______
 
                                        Number of Preferred Securities to be
                                        converted:
 
                                        ______________________________________
 
                                        If a name or names other than the
                                        undersigned, please indicate in the
                                        spaces below the name or names in
                                        which the shares of Alcoa Common
                                        Stock are to be issued, along with
                                        the address or addresses of such
                                        person or persons
 
                                        ______________________________________
                                        ______________________________________
                                        ______________________________________
                                        ______________________________________
                                        ______________________________________
                                        ______________________________________
 
                                        ______________________________________
                                        Signature (for conversion only)
 
                                        Please Print or Typewrite Name and
                                        Address, Including Zip Code, and
                                        Social Security or Other Identifying
                                        Number
 
                                        ______________________________________
                                        ______________________________________
                                        ______________________________________
Signature Guarantee:*
                                        ______________________________________


____________________
*    (Signature must be guaranteed by an institution which is a member of the
     following recognized Signature Guaranty Programs: (i) The Securities
     Transfer Agent Medallion Program (STAMP); (ii) The New York Stock Exchange
     Medallion Program (MSP); (iii) The Stock Exchange Medallion Program (SEMP);
     or (iv) in such other guarantee programs acceptable to the Trustee.

                                      E-2