1

                                                                      EXHIBIT 1



                            Union Tank Car Company
                                     and
                                Procor Limited
                                      
                                 $122,000,000
                                      
                   Pass Through Certificates, Series 1996-A
                                      
                            Underwriting Agreement


                                                              New York, New York
                                                                    May   , 1996


Salomon Brothers Inc
7 World Trade Center
New York, New York  10048

Morgan Stanley & Co. Incorporated
1251 Avenue of the Americas
New York, New York  10020

Dear Ladies and Gentlemen:

         Union Tank Car Company, a Delaware corporation ("Union"), and Procor
Limited, a Canadian corporation and an indirect wholly-owned subsidiary of
Union ("Procor" and, together with Union, the "Companies") propose to cause to
be sold to you the underwriters (the "Underwriters") $122,000,000 aggregate
principal amount of Pass Through Certificates, Series 1996-A1 and Pass Through
Certificates, Series 1996-A2 (together with the guarantee of Union of the due
and punctual distribution to holders of such certificates of principal and
interest payable in respect of the Procor ETC (as hereinafter defined) to be
endorsed on Pass Through Certificates, Series 1996-A2, the "Union Guarantee"),
with the interest rates and final distribution dates as set forth in Schedule A
hereto (the "Pass Through Certificates"), in the respective aggregate principal
amounts set forth on Schedule B hereto, to be issued under (i) the Pass Through
Trust Agreement 1996-A1, dated May __, 1996 (the "Pass Through Trust Agreement
1996-A1"), between Union and _________________, as Pass Through Trustee (the
"Pass Through Trustee") and (ii) the Pass Through Trust Agreement 1996-A2,
dated May __, 1996 (the "Pass Through Trust Agreement 1996-A2", and together
with the





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Pass Through Trust Agreement 1996-A1, the "Pass Through Trust Agreements")
among Union, Procor and the Pass Through Trustee, respectively.

         The property to be purchased by the Pass Through Trustee under Pass
Through Agreement 1996-A1 and contained in such trust shall consist of
$___________ principal amount Equipment Notes, Series A to be issued under the
Indenture.  The property to be purchased by the Pass Through Trustee under Pass
Through Trust Agreement 1996-A2 and contained in such trust shall consist of
(i) $_____________ principal amount Equipment Notes, Series B, (ii) an
aggregate of $_____________ principal amount Equipment Trust Certificates,
Series 26 of Union (together with the guarantee of Union to be endorsed
thereon, the "Union ETCs") to be issued by Union pursuant to an Equipment Trust
Agreement, dated May __, 1996, as may be amended or supplemented from time to
time (the "Union Equipment Trust Agreement"), between Union and
___________________, as trustee (the "Union Equipment Trust Trustee"), and
(iii) a $______________ principal amount Equipment Trust Certificate, Series
26-Can of Procor (together with the guarantee of Procor endorsed thereon, the
"Procor ETC") to be issued by Procor pursuant to an Equipment Trust Agreement,
dated May __, 1996, as may be amended or supplemented from time to time (the
"Procor Equipment Trust Agreement", and together with the Union Equipment Trust
Agreement, the "Equipment Trust Agreements"), between Procor and
________________, as trustee (the "Procor Equipment Trust Trustee", and
together with the Union Equipment Trust Trustee, the "Equipment Trust
Trustees").

         All capitalized terms used, but not defined herein, shall have the
meanings attributed to them in the Pass Through Trust Agreements.  As used in
this Agreement, the term "Operative Agreements" shall have the meaning set
forth in the Participation Agreement.  All other capitalized terms used herein
shall, for the purposes hereof, have the meanings attributed to them in this
Agreement.

         1.      Representations and Warranties.  The Companies represent and
warrant to, and agree with you, that:

                 (a)      The Companies meet the requirements for use of Form
         S-3 under the Securities Act of 1933, as amended (the "Act"), and have
         filed with the Securities and Exchange Commission (the "Commission") a
         registration statement (file number ___________) on such Form,
         including a related Preliminary Prospectus (as hereinafter defined),
         for the registration under the Act of the offering and sale of the
         Pass Through Certificates.  The Companies may have filed one or more
         amendments thereto, including the related Preliminary Prospectus, each
         of which has previously been furnished to you.  The Companies will
         next file with the Commission one of the following:  (i) prior to
         effectiveness of such registration statement, a further amendment to
         such registration statement, including the form of final prospectus or
         (ii) a final prospectus in accordance with Rules 430A and 424(b)(1) or
         (4) under the Act.  In the case of clause (ii), the Companies have
         included in such registration





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         statement, as amended at the Effective Date (as hereinafter defined)
         all information (other than Rule 430A Information (as hereinafter
         defined)) required by the Act and the rules thereunder to be included
         in the Prospectus (as hereinafter defined) with respect to the Pass
         Through Certificates and the offering thereof.  As filed, such
         amendment and form of final prospectus, or such final prospectus,
         shall contain all Rule 430A Information, together with all other such
         required information, with respect to the Pass Through Certificates
         and the offering thereof and, except to the extent you shall agree in
         writing to a modification, shall be in all substantive respects in the
         form furnished to you prior to the Execution Time (as hereinafter
         defined) or, to the extent not completed at the Execution Time, shall
         contain only such specific additional information and other changes
         (beyond that contained in the latest Preliminary Prospectus) as the
         Companies have advised you, prior to the Execution Time, will be
         included or made therein.

                 (b)      On the Effective Date (as hereinafter defined), the
         Registration Statement did or will, and when the Prospectus is first
         filed (if required) in accordance with Rule 424(b) and on the Closing
         Date (as hereinafter defined), the Prospectus (as hereinafter defined)
         (and any supplements thereto) will, comply in all material respects
         with the applicable requirements of the Act and the Securities
         Exchange Act of 1934, as amended (the "Exchange Act"), and the
         respective rules and regulations thereunder; on the Effective Date,
         the Registration Statement (as hereinafter defined) did not or will
         not contain any untrue statement of a material fact or omit to state
         any material fact required to be stated therein or necessary in order
         to make the statements therein not misleading; on the Effective Date
         and on the Closing Date (as hereinafter defined), the Pass Through
         Trust Agreements did or will comply in all material respects with the
         requirements of the Trust Indenture Act of 1939, as amended (the
         "Trust Indenture Act"), and the rules thereunder; and, on the
         Effective Date, the Prospectus, if not filed pursuant to Rule 424(b),
         did not or will not, and on the date of any filing pursuant to Rule
         424(b) and on the Closing Date, the Prospectus (together with any
         supplement thereto) will not, include any untrue statement of a
         material fact or omit to state a material fact necessary in order to
         make the statements therein, in the light of the circumstances under
         which they were made, not misleading; provided, however, that the
         Companies make no representations or warranties as to (i) that part of
         the Registration Statement which shall constitute the Statement of
         Eligibility and Qualification (Form T-1) under the Trust Indenture Act
         of the Pass Through Trustee and (ii) the information contained in or
         omitted from the Registration Statement or the Prospectus (or any
         supplement thereto) in reliance upon and in conformity with
         information furnished in writing to the Company by you specifically
         for use in connection with the preparation of the Registration
         Statement or the Prospectus (or any supplement thereto).

                 (c)      The terms which follow, when used in this Agreement,
         shall have the meanings indicated.  The term "Effective Date" shall
         mean each date that the





                                    - 3 -
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         Registration Statement and any post-effective amendment or amendments
         thereto became or becomes effective.  "Execution Time" shall mean the
         date and time that this Agreement is executed and delivered by the
         parties hereto.  "Preliminary Prospectus" shall mean any preliminary
         prospectus referred to in paragraph (a) above, and any preliminary
         prospectus included in the Registration Statement at the Effective
         Date that omits Rule 430A Information.  "Prospectus" shall mean the
         prospectus relating to the Pass Through Certificates that is first
         filed pursuant to Rule 424(b) after the Execution Time or, if no
         filing pursuant to Rule 424(b) is required, shall mean the form of
         final prospectus relating to the Pass Through Certificates included in
         the Registration Statement at the Effective Date.  "Registration
         Statement" shall mean the registration statement referred to in
         paragraph (a) above, including incorporated documents, exhibits and
         financial statements, as amended at the Execution Time (or, if not
         effective at the Execution Time, in the form in which it shall become
         effective) and, in the event any post-effective amendment thereto
         becomes effective prior to the Closing Date, shall also mean such
         registration statement as so amended.  Such term shall include any
         Rule 430A Information deemed to be included therein at the Effective
         Date as provided by Rule 430A.  "Rule 424", "Rule 430A" and
         "Regulation S-K" refer to such rules or regulation under the Act.
         "Rule 430A Information" means information with respect to the Pass
         Through Certificates and the offering thereof permitted to be omitted
         from the Registration Statement when it becomes effective pursuant to
         Rule 430A.  Any reference herein to the Registration Statement, a
         Preliminary Prospectus or the Prospectus shall be deemed to refer to
         and include the documents incorporated by reference therein pursuant
         to Item 12 of Form S-3 which were filed under the Exchange Act on or
         before the Effective Date or the issue date of such Preliminary
         Prospectus or the Prospectus, as the case may be; and any reference
         herein to the terms "amend", "amendment" or "supplement" with respect
         to the Registration Statement, any Preliminary Prospectus or the
         Prospectus shall be deemed to refer to and include the filing of any
         document under the Exchange Act after the Effective Date of the
         Registration Statement, or, the issue date of any Preliminary
         Prospectus or the Prospectus, as the case may be, deemed to be
         incorporated therein by reference.

                 (d)      The consolidated financial statements incorporated by
         reference in the Registration Statement and Prospectus present fairly
         the consolidated financial position of Union and its subsidiaries as
         at the dates indicated and the consolidated results of their
         operations and cash flows for the periods specified and have been
         prepared in conformity with generally accepted accounting principles
         applied on a consistent basis during the periods involved, except as
         indicated therein, and the supporting schedules incorporated by
         reference in the Registration Statement present fairly the information
         required to be stated therein.

                 (e)      The documents incorporated by reference in the
         Prospectus, at the time they were or hereafter are filed with the
         Commission, complied and will comply in all





                                    - 4 -
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         material respects with the requirements of the Exchange Act, and the
         rules and regulations thereunder.

                 (f)      Since the respective dates as of which information is
         given in the Registration Statement and the Prospectus, except as
         otherwise stated therein or contemplated thereby, there has been no
         material adverse change in the condition, financial or otherwise,
         results of operations or general affairs of Union and its
         subsidiaries, taken as a whole.

                 (g)      Union and each Significant Subsidiary (with such term
         having the meaning attributed to it under Rule 405 under the Act) of
         Union (including Procor) has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of the
         jurisdiction in which it is chartered or organized, with full
         corporate power and authority to own its properties and conduct its
         business as described in the Prospectus, and is duly qualified to do
         business as a foreign corporation and is in good standing under the
         laws of each jurisdiction which requires such qualification wherein it
         owns or leases material properties or conducts material business,
         except in such jurisdictions in which the failure to so qualify would
         not have a material adverse effect on Union and its subsidiaries,
         taken as a whole.  Union owns either directly, or through wholly-owned
         subsidiaries, all of the issued and outstanding capital stock of
         Procor.

                 (h)      The execution and delivery by Union or Procor, as the
         case may be, of this Agreement, the Participation Agreement, the Pass
         Through Trust Agreements, the Lease, the Equipment Trust Agreements
         and the other Operative Agreements to which Union or Procor, as the
         case may be, is, or is to be, a party, the consummation by the
         Companies of the transactions herein and therein contemplated, and the
         compliance by the Companies with the terms hereof and thereof do not
         and will not conflict with, or result in a breach of any of the terms
         or provisions of, or constitute a default under, the Certificate of
         Incorporation or by-laws, as amended, of Union, or the corporate
         charter or by-laws, as amended, of Procor, or any of their respective
         subsidiaries or any material indenture, mortgage, or other agreement
         or instrument to which the Companies or any of their respective
         subsidiaries is a party or by which any of their respective properties
         are bound, or any applicable law, rule, regulation, judgment, order or
         decree of any government, governmental instrumentality or court,
         domestic or foreign, having jurisdiction over the Companies or any of
         their respective subsidiaries or any of their respective properties;
         and, assuming due authorization, execution and delivery by all parties
         thereto other than the Companies, no consent, approval, authorization,
         order or license of, or filing with or notice to any government,
         governmental instrumentality, regulatory body or authority or court,
         domestic or foreign, is required for the valid authorization, issuance
         and delivery of the Pass Through Certificates, the ETCs and the
         Equipment Notes, the valid authorization, execution, delivery and
         performance by Union and Procor, as the case





                                    - 5 -
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         may be, of this Agreement, the Participation Agreement, the Pass
         Through Trust Agreements, the Equipment Trust Agreements and the Lease
         and other Operative Agreements to which Union or Procor, as the case
         may be, is, or is to be, a party, or the consummation by the Companies
         of the transactions contemplated by this Agreement, the Participation
         Agreement, the Pass Through Trust Agreements, the Equipment Trust
         Agreements and the Lease and other Operative Agreements to which Union
         or Procor, as the case may be, is, or is to be, a party, except (w)
         such as are required under the Act, the Trust Indenture Act and the
         securities or Blue Sky laws of the various states, (x) such filings,
         recordings or registrations with the Surface Transportation Board of
         the Department of Transportation (the "STB") and under Section 90 of
         the Railway Act (Canada) as may be required, (y) the filing of Uniform
         Commercial Code financing statements in various jurisdictions and the
         filing of continuation statements with respect thereto required to be
         filed at periodic intervals under the Uniform Commercial Code and (z)
         such other filings, recordings or registrations as may be required
         under the Operative Agreements.

                 (i)      This Agreement, the Participation Agreement, the Pass
         Through Trust Agreements, the Equipment Trust Agreements and the Lease
         and the other Operative Agreements to which Union or Procor, as the
         case may be, is, or is to be, a party, have each been duly authorized
         by Union or Procor, as the case may be, and, when executed and
         delivered by Union or Procor, as the case may be, will constitute
         valid and binding obligations of Union or Procor, as the case may be,
         and the Pass Through Trust Agreements will have been duly qualified
         under the Trust Indenture Act.  On the Closing Date, the Equipment
         Trust Agreements, the Lease and other Operative Agreements to which
         Union or Procor, as the case may be, is, or is to be, a party will
         constitute the valid and binding obligations of Union or Procor, as
         the case may be.  The Pass Through Certificates, the ETCs, the
         Equipment Notes, the Indenture, the Participation Agreement, the Pass
         Through Trust Agreements, the Equipment Trust Agreements and the Lease
         and the other Operative Agreements to which Union or Procor, as the
         case may be, is, or is to be, a party will conform in all material
         respects to the descriptions thereof in the Prospectus.

                 (j)      Ernst & Young LLP ("Ernst & Young"), who reported on
         the consolidated financial statements of Union as of December 31, 1995
         and for the year then ended, which statements are incorporated by
         reference in the Registration Statement and Prospectus, were, as of
         the date of its report on such consolidated financial statements,
         independent auditors as required by the Act and the rules and
         regulations thereunder.

                 (k)      The Pass Through Certificates, when duly executed,
         authenticated and delivered by the Pass Through Trustee in accordance
         with the terms of the Pass Through Trust Agreements and this
         Agreement, will be duly issued under the Pass Through Trust Agreements
         and will constitute valid and binding obligations of the





                                    - 6 -
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         Pass Through Trustee; and the holders thereof will be entitled to the
         benefits of the Pass Through Trust Agreements.

                 (l)      Assuming due authorization, execution and delivery of
         the Equipment Notes to be issued under the Indenture by the Owner
         Trustee and due authentication of such Equipment Notes by the
         Indenture Trustee in accordance with the terms of the Indenture, the
         Equipment Notes will be duly issued under the Indenture and will
         constitute valid and binding obligations of such Owner Trustee; and
         the holders thereof will be entitled to the benefits of the Indenture.

         2.      Purchase and Sale.  Subject to the terms and conditions and in
reliance upon the representations and warranties herein set forth, the
Companies agree to request the Pass Through Trustee to sell to each of you, in
the respective aggregate principal amounts set forth on Schedule B hereto, and
each of you severally, not jointly, agrees to purchase from the Pass Through
Trustee, at a purchase price of 100% of the principal amount thereof, the
respective aggregate principal amounts of Pass Through Certificates set forth
on such Schedule B.

         As compensation to each of you for its commitment and obligations
hereunder in respect of the Pass Through Certificates, including its
undertaking to distribute the Pass Through Certificates, the Owner Trustee has,
pursuant to Section 2.5 of the Participation Agreement, undertaken to pay, or
if the Owner Trustee does not pay when due, Union will pay when due, to you an
amount equal to the product of ____% times a fraction, the numerator of which
is the aggregate principal amount of Equipment Notes to be purchased by the
Pass Through Trusts and the denominator of which is the original principal
amount of the Pass Through Certificates purchased by you.  Union will pay to
you when due an amount equal to ____% of the original aggregate principal
amount of the Union ETCs and Procor will pay to you when due an amount equal to
____% of the original aggregate principal amount of the Procor ETC.  Subject to
the terms hereof, Procor's obligation to make such payment is hereby
unconditionally guaranteed by Union.  Such payments shall be made
simultaneously with the payment by you to the Pass Through Trustee of the
purchase price of the Pass Through Certificates as specified in Section 3
hereof.  Payment of such compensation shall be made by Federal funds check or
other immediately available funds to the order of Salomon Brothers Inc.

         3.      Delivery and Payment.  Delivery of and payment for the Pass
Through Certificates shall be made at the offices of Neal, Gerber & Eisenberg,
Two North LaSalle Street, Chicago, Illinois, at 10:00 a.m. C.S.T., on May __,
1996 or such later date and time (not later than May __, 1996) as the Companies
and you shall determine (such date and time of delivery and payment for the
Pass Through Certificates being herein called the "Closing Date").  Delivery of
the Pass Through Certificates shall be made to your account at The Depository
Trust Company against payment by you of the purchase price thereof to or upon
the order of the Pass Through Trustee by Federal funds check or other
immediately available





                                    - 7 -
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funds.  The Pass Through Certificates shall be registered in such names and in
such denominations as you may request not less than three full business days in
advance of the Closing Date or such other date as may be agreed upon.

         The Companies agree to have the Pass Through Certificates available
for inspection, checking and packaging by you in New York City, not later than
1:00 p.m. (New York City time) on the business day prior to the Closing Date.

         4.      Offering by Salomon Brothers Inc. and Morgan Stanley & Co.
Incorporated.  It is understood that, after the Registration Statement becomes
effective, each of you propose to offer the Pass Through Certificates for sale
to the public as set forth in the Prospectus.

         5.      Agreements.  The Companies agree with you that:

                 (a)      The Companies will each use their reasonable best
         efforts to cause the Registration Statement, if not effective at the
         Execution Time, and any amendment thereof, to become effective and the
         Pass Through Trust Agreement to be qualified under the Trust Indenture
         Act.  The Companies will not file any amendment of the Registration
         Statement or supplement to the Prospectus unless the Companies have
         furnished you a copy for your review prior to filing and will not file
         any such proposed amendment or supplement to which you reasonably
         object.  Subject to the foregoing sentence, if filing of the
         prospectus is required under Rule 424(b), the Companies will cause the
         Prospectus, properly completed, and any supplement thereto to be filed
         with the Commission pursuant to the applicable paragraph of Rule
         424(b) within the time period prescribed and will provide evidence
         satisfactory to you of such timely filing.  The Companies will
         promptly advise you (i) when the Registration Statement, if not
         effective at the Execution Time, and any amendment thereto, shall have
         become effective, (ii) when the Prospectus, and any supplement
         thereto, shall have been filed (if required) with the Commission
         pursuant to Rule 424(b), (iii) when, prior to termination of the
         offering of the Pass Through Certificates, any amendment to the
         Registration Statement shall have been filed or become effective, (iv)
         of any request by the Commission for any amendment of the Registration
         Statement or supplement to the Prospectus or for any additional
         information, (v) of the issuance by the Commission of any stop order
         suspending the effectiveness of the Registration Statement or the
         institution or threatening of any proceeding for that purpose (and
         each of the Companies agree that it will each use its reasonable best
         efforts to prevent the issuance of any such stop order and, if issued,
         to obtain as soon as possible the withdrawal thereof), (vi) of the
         receipt by the Companies of any notification with respect to the
         suspension of the qualification of the Pass Through Certificates for
         sale in any jurisdiction or the initiation or threatening of any
         proceeding for such purpose and (vii) during the period when a
         prospectus relating to the Pass Through Certificates is required to be
         delivered under the Act, of the mailing or the delivery to the
         Commission for filing of any document to be filed pursuant to the
         Exchange Act.





                                    - 8 -
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                 (b)      If, at any time when a prospectus relating to the
         Pass Through Certificates is required to be delivered under the Act,
         any event occurs as a result of which the Prospectus as then
         supplemented would include any untrue statement of a material fact or
         omit to state any material fact necessary to make the statements
         therein, in the light of the circumstances under which they were made,
         not misleading, or if it shall be necessary to amend the Registration
         Statement or supplement the Prospectus to comply with the Act or the
         Exchange Act or the respective rules and regulations thereunder, the
         Companies promptly will prepare and file with the Commission, subject
         to paragraph (a) of this Section 5, an amendment or supplement which
         will correct such statement or omission or an amendment which will
         effect such compliance.

                 (c)      As soon as practicable, Union will make generally
         available to its security holders and to the Underwriters an earnings
         statement or statements of Union and its subsidiaries which will
         satisfy the provisions of Section 11(a) of the Act and the applicable
         rules and regulations thereunder.

                 (d)      The Companies will furnish to you and your counsel,
         without charge, signed copies of the Registration Statement (including
         exhibits thereto) and, so long as delivery of a prospectus by you or a
         dealer may be required by the Act, as many copies of each Preliminary
         Prospectus and the Prospectus and any amendments thereof and
         supplements thereto as you may reasonably request.  Subject to the
         provisions of Section 2.5 of the Participation Agreement, the
         Companies will pay the expenses of printing all documents relating to
         the offering.

                 (e)      The Companies will cooperate with you and your
         special counsel to arrange for the qualification of the Pass Through
         Certificates for sale under the laws of such jurisdictions as you may
         reasonably designate, will maintain such qualifications in effect so
         long as required for the distribution of the Pass Through Certificates
         and will arrange for the determination of the legality of the Pass
         Through Certificates for purchase by institutional investors;
         provided, however, that the Companies will not be required to qualify
         to do business in any jurisdiction in order to effect such
         qualification.

                 (f)      Between the date of this Agreement and the Closing
         Date, the Companies will not without your prior written consent offer,
         sell, or enter into any agreement to sell, any public debt securities
         registered under the Act (other than the Pass Through Certificates).

                 (g)      The Companies confirm as of the date hereof that each
         is in compliance with all provisions of Section 1 of Laws of Florida,
         Chapter 92-198, An Act Relating to Disclosure of Doing Business with
         Cuba, and the Companies further agree that if either Union or Procor
         commences engaging in business with the government of Cuba





                                     - 9 -
   10
         or with any person or affiliate located in Cuba after the date the
         Registration Statement becomes or has become effective with the
         Commission or with the Florida Department of Banking and Finance (the
         "Department"), whichever date is later, or if the information reported
         in the Prospectus, if any, concerning Union's or Procor's business
         with Cuba or with any person or affiliate located in Cuba changes in
         any material way, the Companies will provide the Department notice of
         such business or change, as appropriate, in a form acceptable to the
         Department.

         6.      Conditions to the Obligations of Salomon Brothers Inc and
Morgan Stanley & Co. Incorporated.  Your obligations to purchase the Pass
Through Certificates shall be subject to the accuracy of the representations
and warranties on the part of the Companies contained herein as of the
Execution Time and the Closing Date, to the accuracy of the statements of the
Companies made in any certificates delivered pursuant to the provisions hereof,
to the performance by the Companies of their obligations hereunder and to the
following additional conditions:

                 (a)      The Registration Statement shall have become
         effective not later than (i) 5:00 p.m., New York City time, on the
         date of determination of the public offering price, if such
         determination occurred at or prior to 3:00 p.m., New York City time,
         on such date or (ii) 12:00 noon, New York City time, on the business
         day following the day on which the public offering price was
         determined, if such determination occurred after 3:00 p.m., New York
         City time, on such date; if filing of the Prospectus, or any
         supplement thereto, is required pursuant to Rule 424(b), the
         Prospectus, and any such supplement, will be filed in the manner and
         within the time period required by Rule 424(b); and no stop order
         suspending the effectiveness of the Registration Statement shall have
         issued and no proceedings for that purpose shall have been instituted
         or threatened.

                 (b)      The Companies shall have furnished to you and to
         Moody's Investors Service and Standard and Poor's Corp. (together, the
         "Rating Agencies"), if requested by you, the opinion of Neal, Gerber &
         Eisenberg, special counsel to Union (incorporating and relying upon
         the opinions of Peter E. Lawford, Esquire, General Counsel of Procor,
         and Osler, Hoskin & Harcourt, special Canadian counsel to Procor, as
         to Canadian law matters, and Hogan & Hartson, special STB counsel to
         Union, as to STB matters), dated the Closing Date, in form reasonably
         satisfactory to you and to Mayer, Brown & Platt, special counsel of
         the Underwriters, to the effect that:

                          (i)  Each of Union and its Significant Subsidiaries
                 (including Procor) has been duly incorporated and is validly
                 existing as a corporation in good standing under the laws of
                 the jurisdiction in which it is chartered or organized, with
                 full corporate power and authority to own its properties and
                 conduct its business as described in the Prospectus, and is
                 duly qualified to do





                                    - 10 -
   11
                 business as a foreign corporation and is in good standing
                 under the laws of each jurisdiction which requires such
                 qualification wherein it owns or leases material properties or
                 conducts material business, except in such jurisdictions in
                 which the failure to so qualify would not have a material
                 adverse effect on Union and its subsidiaries, taken as a
                 whole.

                          (ii)  all the outstanding shares of capital stock of
                 Procor have been duly and validly authorized and issued and
                 are fully paid and nonassessable, and, all such capital stock
                 of Procor is owned by Union, either directly or through wholly
                 owned subsidiaries, free and clear of any perfected security
                 interest and, to the knowledge of such counsel, after due
                 inquiry, any other security interest, claims, liens or
                 encumbrances.

                          (iii) each of Union and Procor has the corporate
                 power and authority under the laws of the jurisdiction in
                 which it is chartered or organized to perform its obligations
                 hereunder and under the Participation Agreement, the Pass
                 Through Trust Agreements, the Equipment Trust Agreements, the
                 Lease and the other Operative Agreements to which Union or
                 Procor, as the case may be, is, or is to be, a party;

                          (iv)  subject to the limitations and qualifications
                 set forth in clause (xvi) of this Section 6(b), assuming that
                 the Pass Through Certificates have been duly authorized and
                 validly executed, authenticated, issued and delivered by the
                 Pass Through Trustee pursuant to the Pass Through Trust
                 Agreements, the holders of such Pass Through Certificates are
                 entitled to the benefits of the Pass Through Trust Agreements;

                          (v)  the Pass Through Certificates conform in all
                 material respects to the description thereof contained in the
                 Prospectus, and such description conforms in all material
                 respects to the rights set forth in the instruments defining
                 the same;

                          (vi)  no authorization, approval, consent, order or
                 license of or filing with or notice to any government,
                 governmental instrumentality, regulatory body or authority or
                 court is required for the valid authorization, execution,
                 delivery and performance by the Companies of this Agreement,
                 the Participation Agreement, the Pass Through Trust
                 Agreements, the Equipment Trust Agreements, the Lease and the
                 other Operative Agreements to which Union or Procor, as the
                 case may be, is, or is to be, a party, or the consummation by
                 Union or Procor, as the case may be, of the transactions
                 contemplated by this Agreement, the Participation Agreement,
                 the Pass Through Trust Agreements, the Equipment Trust
                 Agreements, the Lease and the other Operative Agreements to
                 which Union or Procor, as the case may





                                    - 11 -

   12
                 be, is, or is to be, a party, except (w) such as are required
                 under the Act, the Trust Indenture Act and the securities or
                 Blue Sky laws of the various states, (x) such filings,
                 recordings or registrations with the STB and under Section 90
                 of the Railway Act (Canada) as may be required, (y) the filing
                 of Uniform Commercial Code financing statements in various
                 jurisdictions and the filing of continuation statements with
                 respect thereto required to be filed at periodic intervals
                 under the Uniform Commercial Code and (z) such other filings,
                 recordings or registrations as may be required under the
                 Operative Agreements;

                          (vii)  to the best knowledge of such counsel, there
                 is no pending or threatened action, suit or proceeding before
                 any court or governmental agency, authority or body or any
                 arbitrator involving the Companies or any of their respective
                 subsidiaries, of a character required to be disclosed in the
                 Registration Statement or the Prospectus which is not
                 adequately disclosed, and there is no franchise, contract or
                 other document of a character required to be described in the
                 Registration Statement or Prospectus, or to be filed as an
                 exhibit, which is not described or filed as required;

                          (viii)  the Registration Statement has become
                 effective under the Act; any required filing of the
                 Prospectus, and any supplements thereto, pursuant to Rule
                 424(b) has been made in the manner and within the time period
                 required by Rule 424(b); the Pass Through Trust Agreements
                 have become qualified under the Trust Indenture Act; to the
                 knowledge of such counsel, no stop order suspending the
                 effectiveness of the Registration Statement has been issued,
                 no proceedings for that purpose have been instituted or
                 threatened, and the Registration Statement, the Prospectus and
                 each amendment thereof or supplement thereto (other than the
                 financial statements and related schedules and other financial
                 and statistical information, including the notes thereto,
                 included or incorporated by reference therein as to which such
                 counsel need express no opinion) comply as to form in all
                 material respects with the applicable requirements of the Act
                 and the Exchange Act and the respective rules and regulations
                 thereunder; the Pass Through Trust Agreements and the
                 Statement of Eligibility and Qualification of the Pass Through
                 Trustee on Form T-1 comply as to form in all material respects
                 with the requirements of the Trust Indenture Act and the rules
                 and regulations thereunder; and each document filed pursuant
                 to the Exchange Act and incorporated by reference in the
                 Prospectus (except for the financial statements, including the
                 notes thereto, and related schedules and other financial and
                 statistical information included or incorporated by reference
                 therein, as to which such counsel need express no opinion)
                 appeared on its face, as of its respective filing date, to
                 comply as to form in all material respects with the
                 requirements of the Exchange Act and the rules and regulations
                 thereunder;





                                    - 12 -
   13
                          (ix)  title to the equipment to be subjected to the
                 Lease will, when such equipment shall have been transferred to
                 the Owner Trustee as provided in the Participation Agreement,
                 be validly vested in the Owner Trustee, subject to no liens or
                 encumbrances of record at the STB;

                          (x)   other than rights of the Companies under the
                 respective Equipment Trust Agreements, title to the equipment
                 to be subjected to the Equipment Trust Agreements will, when
                 such equipment shall have been transferred to the Equipment
                 Trust Trustees as provided in the Equipment Trust Agreements,
                 be validly vested in the respective Equipment Trust Trustee;
                 the Equipment Trust Agreements have been duly filed and
                 recorded with the STB and the Registrar General of Canada and
                 such equipment is subject to no liens or encumbrances of
                 record at the STB and the Registrar General of Canada;

                          (xi)  this Agreement, the Pass Through Trust
                 Agreements, the Participation Agreement, the Equipment Trust
                 Agreements, the Lease, and all the other Operative Agreements
                 to which Union or Procor is, or is to be, a party have been
                 duly authorized and, on the Closing Date, assuming due
                 authorization, execution and delivery by the parties thereto
                 other than Union or Procor, as the case may be, upon execution
                 and delivery by Union or Procor, as the case may be, will be
                 valid and binding obligations of Union or Procor, as the case
                 may be, enforceable against Union or Procor, as the case may
                 be, in accordance with their respective terms, except (i) as
                 may be limited by bankruptcy, insolvency, reorganization,
                 moratorium or other similar laws affecting enforcement of
                 creditors' rights generally and by general principles of
                 equity (regardless of whether enforcement is considered in a
                 proceeding in equity or at law), (ii) in the case of the
                 Lease, as limited by applicable laws which may affect the
                 remedies provided in the Lease, which laws, however, do not in
                 such counsel's opinion make the remedies provided in the Lease
                 inadequate for the practical realization of the rights and
                 benefits provided thereby and (iii) in the case of this
                 Agreement, as to provisions relating to indemnification or
                 contribution for liabilities arising under the Act, as to
                 which such counsel need express no opinion;

                          (xii)  the Pass Through Trust Agreements, the
                 Equipment Notes, the ETCs, the Indenture, the Participation
                 Agreement, the Equipment Trust Agreements, the Lease and the
                 other Operative Agreements (to the extent described therein)
                 conform in all material respects to the descriptions thereof
                 contained in the Prospectus;

                          (xiii)  the execution and delivery by the Companies
                 of this Agreement, the Participation Agreement, the Pass
                 Through Trust Agreements, the Equipment Trust Agreements, the
                 Lease and the other Operative Agreements





                                    - 13 -
   14
                 to which Union or Procor, as the case may be, is, or is to be,
                 a party, the consummation by the Companies of the transactions
                 herein and therein contemplated and in the manner herein and
                 therein contemplated and compliance by the Companies with the
                 terms hereof and thereof, do not and will not conflict with,
                 or result in a breach by the Companies of, any of the terms or
                 provisions of, or constitute a default under, any material
                 indenture or other agreement or instrument known to such
                 counsel to which the Companies are a party or by which the
                 Companies are bound, or any law, rule, regulation, judgment or
                 order known to such counsel to be applicable to the Companies
                 of any court, regulatory body, administrative agency,
                 government or governmental body having jurisdiction over the
                 Companies, except that such counsel need express no opinion or
                 belief as to the accuracy or completeness of the Registration
                 Statement or Prospectus except for the opinions expressed in
                 clauses (v), (xii), and (xiv) (except that such counsel need
                 not express any opinion as to any violation of any such law,
                 rule or regulation, judgment or order (a) which does not
                 materially affect the validity of the Equipment Notes, the
                 ETCs or the Pass Through Certificates or (b) which reflects
                 conclusions based on misrepresentations to, concealment of
                 information from or other fraudulent acts perpetrated on such
                 counsel);

                          (xiv)  the statements in the Registration Statement
                 and Prospectus under the headings "Certain Federal Income Tax
                 Consequences", "Certain _________ Taxes" and "ERISA
                 Considerations", to the extent that they constitute matters of
                 law or legal conclusions with respect thereto, have been
                 prepared or reviewed by such counsel and are correct in all
                 material respects;

                          (xv)  neither Union nor Procor is an "investment
                 company" or a company "controlled" by an "investment company"
                 within the meaning of the Investment Company Act of 1940, as
                 amended;

                          (xvi)  on the Closing Date, assuming due
                 authorization, execution, issuance and delivery of the ETCs by
                 their respective Equipment Trust Trustee as contemplated by
                 the related Equipment Trust Agreement, and assuming due
                 authorization, execution, issuance and delivery of the
                 Equipment Notes by the Owner Trustee as contemplated by the
                 Indenture, and due authentication of such ETCs by the
                 respective Equipment Trust Trustee and of such Equipment Notes
                 by the Indenture Trustee, each of the ETCs and the Equipment
                 Notes when issued will constitute valid and binding
                 obligations of such Equipment Trust Trustee and the Owner
                 Trustee, respectively, enforceable against such Equipment
                 Trust Trustee and the Owner Trustee, respectively, in
                 accordance with their terms, except as may be limited by
                 bankruptcy, insolvency, reorganization, moratorium or other
                 similar laws affecting enforcement of creditors' rights
                 generally and by general principles of equity (regardless of





                                     - 14 -
   15
                 whether enforcement is considered in a proceeding in equity or
                 at law); and the holders of the ETCs will be entitled to the
                 benefits of the respective Equipment Trust Agreement, and the
                 holders of the Equipment Notes will be entitled to the
                 benefits of the Indenture;

                          (xvii)  assuming due authorization, execution and
                 delivery of the Pass Through Trust Agreements by the Pass
                 Through Trustee, each of the Pass Through Trust Agreements
                 constitutes the valid and binding obligation of each of the
                 Companies party to such Pass Through Agreement enforceable in
                 accordance with its terms, except as may be limited by
                 bankruptcy, insolvency, reorganization, moratorium or other
                 similar laws affecting enforcement of creditors' rights
                 generally and by general principles of equity (regardless of
                 whether enforcement is considered in a proceeding in equity or
                 at law);

                          (xviii)  neither trust created by the Pass Through
                 Trust Agreements [will] be classified as an association
                 taxable as a corporation for federal income tax purposes, but
                 rather, each [will] be classified as a grantor trust under
                 subpart E, Part I of Subchapter J of the Internal Revenue Code
                 of 1986, as amended (the "Code"), and each Certificate Owner
                 will be treated as the owner of a pro rata undivided interest
                 in each of the ETCs and Equipment Notes, as the case may be,
                 and any other property held in such Pass Through Trusts;

                          (xix)  although counsel is not aware of any judicial
                 authority, the Pass Through Trusts are not required to be
                 registered under the Investment Company Act of 1940, as
                 amended;

                          (xx)  assuming due authorization, execution and
                 delivery of the Indenture by the parties thereto, the
                 Indenture will subject the Indenture Estate covered by the
                 Indenture to the security interests created thereby;

                          (xxi)  there are no taxes, fees or other governmental
                 charges payable under the laws of the State of __________ or
                 any political subdivision thereof in connection with the
                 execution and delivery by the Pass Through Trustee, in its
                 individual capacity or as Pass Through Trustee, the Equipment
                 Trust Trustee or Indenture Trustee, as the case may be, of the
                 Participation Agreement, the Pass Through Trust Agreements,
                 the Equipment Trust Agreements and the Operative Agreements,
                 as the case may be, or in connection with the issuance,
                 execution, authentication and delivery of the Pass Through
                 Certificates by the Pass Through Trustee pursuant to the Pass
                 Through Trust Agreements or the issuance, authentication or
                 delivery of the ETCs and the Equipment Notes;





                                     - 15 -
   16
                          (xxii)  Except to the extent the Indenture Trustee
                 forecloses on the Equipment and any of the Equipment is
                 located in _________ or the Equipment Trust Trustee forecloses
                 on the Trust Equipment and any of the Trust Equipment is
                 located in the State of ___________ or to the extent the
                 Indenture Estate, the trust created by the Union Equipment
                 Trust Agreement, the trust created by the Procor Equipment
                 Trust Agreement or the trusts created by the Pass Through
                 Trust Agreements, as applicable, engages in business in
                 __________ as a result of such foreclosure:

                                  (I) neither the trusts created by the Pass
                 Through Trust Agreements, the Equipment Trust Agreements, the
                 Indenture Estate nor the Pass Through Trustee (either in its
                 individual capacity or as Pass Through Trustee), nor their
                 respective affiliates, successors or assigns, will be subject
                 to any tax (including, without limitation, net or gross
                 income, tangible or intangible property, net worth, capital,
                 franchise or doing business tax), fee or other governmental
                 charge under the laws of the State of __________ or any
                 political subdivision thereof (other than taxes imposed on the
                 fees received by the Pass Through Trustee for acting as Pass
                 Through Trustee under the Pass Through Trust Agreements).

                                  (II) Certificate Owners who are not residents
                 of or otherwise subject to tax in the State of ____________
                 will not be subject to any tax (including, without limitation,
                 net or gross income, tangible or intangible property, net
                 worth, capital, franchise or doing business tax), fee or other
                 governmental charge under the laws of the State of __________
                 or any political subdivision thereof as a result of
                 purchasing, holding (including receiving payments with respect
                 to) or selling a Certificate.

                                  (III) There are no applicable taxes under the
                 laws of the State of ______________ or any political
                 subdivision thereof upon or with respect to (a) the
                 construction, mortgaging, financing, refinancing, purchase,
                 acquisition, acceptance, rejection, delivery, nondelivery,
                 transport, location, ownership, insurance, control, assembly,
                 possession, repossession, operation, use, condition,
                 maintenance, repair, sale, return, abandonment, replacement,
                 preparation, installation, storage, redelivery, manufacture,
                 leasing, subleasing, modification, rebuilding, importation,
                 transfer of title, transfer of registration, exportation or
                 other application or disposition of the Equipment or any
                 interest in any thereof, (b) payments of Rent or the receipts,
                 income or earnings arising therefrom or received with respect
                 to the Equipment or any interest in any thereof or payable
                 pursuant to the Lease, (c) any amount paid or payable pursuant
                 to any Operative Agreement, (d) the Equipment or any interest
                 therein or the applicability of the Lease to the Equipment or
                 any interest thereof, (e) any or all of the Operative
                 Agreements, any or all of the ETCs or





                                     - 16 -
   17
                 the Equipment Notes or any interest in any or all thereof or
                 the offering, registration, reregistration, issuance,
                 acquisition, modification, assumption, reissuance, refinancing
                 or refunding or any or all thereof, and any other documents
                 contemplated hereby or thereby and amendments and supplements
                 hereto and thereto, (f) the payment of the principal of, or
                 interest or premium on, or other amounts payable with respect
                 to, any or all of the ETCs or the Equipment Notes, whether as
                 originally issued or pursuant to any refinancing, refunding,
                 assumption, modification, or reissuance, or any other
                 obligation evidencing any loan in replacement of the loan
                 evidenced by any or all of the ETCs or the Equipment Notes,
                 (g) the property, or the income, earnings, receipts or other
                 proceeds received with respect to the property, held by the
                 Indenture Trustee under the Indenture or held by the Equipment
                 Trust Trustees under the respective Equipment Trust Agreements
                 or (h) otherwise with respect to or in connection with the
                 transactions contemplated by the Operative Agreements, which
                 would not have been imposed if the Indenture Trustee or the
                 Equipment Trust Trustees had not had their principal place of
                 business in, had not performed (either in its individual
                 capacity or as Indenture Trustee) any or all of their
                 administrative duties under the Operative Agreements in, and
                 had not engaged in any activities unrelated to the
                 transactions contemplated by the Operative Agreements in, the
                 State of ___________;

                          (xxiii)  the Union Guarantee contained in Pass
                 Through Agreement 1996-A2 and endorsed on the Pass Through
                 Certificates issued under such agreement has been duly
                 authorized, executed and delivered by Union and assuming the
                 due authorization, execution and delivery of the Pass Through
                 Trust Agreement 1996-A2 and the due authentication of such
                 Pass Through Certificates by the Pass Through Trustee,
                 constitutes a valid and binding obligation of Union,
                 enforceable against Union in accordance with its terms, except
                 as may be limited by bankruptcy, insolvency, reorganization,
                 moratorium or other similar laws affecting enforcement of
                 creditors' rights generally and by general principals of
                 equity (regardless of whether enforcement is considered in a
                 proceeding in equity or at law); and

                          (xxiv)  neither the Union Equipment Trust Agreement
                 can be terminated by Union nor the Procor Equipment Trust
                 Agreement can be terminated by Procor so long as the Union ETC
                 and the Procor ETC, respectively, are outstanding.

         In passing on the form of the Registration Statement and the
         Prospectus and each amendment and supplement thereof, such counsel may
         state that it has not independently verified the accuracy,
         completeness or fairness of the statements made or included therein
         and takes no responsibility therefor and that such opinion is based
         upon such counsel's examination of the Registration Statement, the
         Prospectus as





                                     - 17 -
   18
         amended or supplemented, its activities in connection with the
         preparation thereof and its participation in conferences with certain
         officers and employees of Union, Procor and their respective
         subsidiaries and with representatives of Ernst & Young and any others
         referred to in such opinion, and subject to the same qualifications,
         such counsel may also state that, although they are not passing upon,
         and do not assume any responsibility for, the accuracy, completeness
         or fairness of the statements contained in the Registration Statement
         and Prospectus and have not made any independent check or verification
         thereof, nothing has come to their attention in their examination of
         the Registration Statement, their participation in the preparation
         thereof and participation in the above-referenced conferences that has
         caused them to believe that the Registration Statement, at the time it
         became effective, contained an untrue statement of a material fact or
         omitted to state a material fact required to be stated therein or
         necessary to make the statements therein not misleading, or the
         Prospectus, as of its date and as of the Closing Date, contained an
         untrue statement of a material fact or omitted to state a material
         fact necessary to make the statements therein, in the light of the
         circumstances under which they were made, not misleading.  In
         rendering such opinion, such counsel may state that it expresses no
         opinion as to the laws of any jurisdiction other than the State of
         __________, the General Corporation Law of the State of Delaware and
         the Federal law of the United States of America and may rely (A) as to
         matters involving the application of (x) laws of Canada or its
         Provinces and (y) laws, rules and regulations with respect to the STB
         to the extent deemed proper and specified in such opinion, upon the
         opinion of other counsel of good standing whom such counsel believes
         to be reliable and who are satisfactory to you and your counsel; and
         (B) as to matters of fact, to the extent deemed proper, on
         certificates of responsible officers of the Company and public
         officials, and may assume for purposes of its opinion with respect to
         this Agreement set forth in Section 6(b)(xi) that the laws of the
         State of New York are identical to the laws of the State of
         ______________.

                 (c)      The Companies shall have furnished to you and the
         Rating Agencies if requested by you, the opinion of Olser, Hoskin &
         Harcourt, special Canadian counsel to Procor, as to Canadian law
         matters, to the effect that

                          (i)  the payment by Procor of interest and principal
                 on the Procor ETC to the Pass Through Trustee will be exempt
                 from Canadian withholding tax; the payment by the Pass Through
                 Trustee of interest and principal on the Pass Through
                 Certificate, Series 1996-A2 to a holder thereof will be exempt
                 from Canadian withholding tax for a holder who is, or is
                 deemed to be, a non-resident of Canada and with whom Union and
                 Procor deals at arm's length, within the meaning of the Income
                 Tax Act (Canada) (the "Tax Act"), at the time of making the
                 payment; and





                                     - 18 -
   19
                          (ii)  no other taxes on income (including taxable
                 capital gains) will be payable under the Tax Act in respect of
                 the holding or disposition of the Procor ETC, or the receipt
                 of interest thereon, by the Pass Through Trustee; no other
                 taxes on income (including taxable capital gains) will be
                 payable under the Tax Act in respect of the acquisition,
                 holding or disposition of the Pass Through Certificates,
                 Series 1996-A2, or the receipt of interest thereon by holders
                 who are, or are deemed to be, non-residents of Canada for the
                 purposes of the Tax Act at any time during which they hold
                 Pass Through Certificates, Series 1996-A2 and who do not use
                 or hold and are not deemed by such laws to use or hold the
                 Pass Through Certificates, Series 1996-A2 in carrying on
                 business in Canada for the purposes of the Tax Act, and, in
                 the case of a Certificate Owner who carries on an insurance
                 business in Canada and elsewhere whose Pass Through
                 Certificates are not effectively connected with its Canadian
                 insurance business.  In rendering such opinion, such counsel
                 may state that it expresses no opinion as to the laws of any
                 jurisdiction other than Canada or its Provinces.

                 (d)      You shall have received from the ________________,
         counsel for _______________, individually, as Pass Through Trustee,
         Equipment Trust Trustee and Indenture Trustee, an opinion, dated the
         Closing Date, in form and substance reasonably satisfactory to you and
         Mayer, Brown & Platt, your special counsel to the effect that:

                          (i)  ________________ is a national banking
                 association validly existing and holding a valid certificate
                 to do business as a national banking association with trust
                 powers, and, in its individual capacity or as Pass Through
                 Trustee, Equipment Trust Trustee or Indenture Trustee, as the
                 case may be, has full corporate power and authority to
                 execute, deliver and carry out the terms of the Indenture, the
                 Equipment Trust Agreements, the Participation Agreement, the
                 Pass Through Trust Agreements and the other Operative
                 Agreements to which it is a party;

                          (ii)  _____________ (in its individual capacity, to
                 the extent provided therein), the Pass Through Trustee, the
                 Equipment Trust Trustee or the Indenture Trustee, as the case
                 may be, has duly authorized, executed and delivered the
                 Indenture, the Participation Agreement, the Equipment Trust
                 Agreements, the Pass Through Trust Agreements and the other
                 Operative Agreements to which it is a party and each of such
                 agreements constitutes the valid and binding obligations of
                 ________________ (in its individual capacity, to the extent
                 provided therein), the Pass Through Trustee, the Equipment
                 Trust Trustee or the Indenture Trustee, as the case may be,
                 enforceable against _______________ (in its individual
                 capacity, to the extent provided therein), the Pass Through
                 Trustee, the Equipment Trust Trustee or the Indenture





                                     - 19 -
   20
                 Trustee, as the case may be, in accordance with their
                 respective terms, except as limited by bankruptcy, insolvency,
                 moratorium reorganization, receivership, fraudulent conveyance
                 or other similar laws affecting enforcement of creditors'
                 rights generally, and except as enforcement thereof is subject
                 to general principles of equity (regardless of whether
                 enforcement is considered in a proceeding in equity or at
                 law);

                          (iii)  the Pass Through Certificates have been duly
                 authorized and validly executed, authenticated, issued and
                 delivered by the Pass Through Trustee pursuant to the Pass
                 Through Trust Agreements; and the holders of the Pass Through
                 Certificates are entitled to the benefits of the Pass Through
                 Trust Agreements;

                          (iv)  the authorization, execution, delivery and
                 performance by _____________ (in its individual capacity, to
                 the extent provided therein), the Pass Through Trustee, the
                 Equipment Trust Trustee or the Indenture Trustee, as the case
                 may be, of the Indenture, the Participation Agreement, the
                 Equipment Trust Agreements, the Pass Through Trust Agreements
                 and the other Operative Agreements to which it is or will be
                 party and the consummation of the transactions therein
                 contemplated and compliance with the terms thereof and
                 issuance of the Pass Through Certificates thereunder do not
                 and will not result in the violation of the provisions of the
                 Articles of Association or By-Laws of ____________, and do not
                 and will not conflict with, or result in a breach of any terms
                 or provisions of, or constitute a default under, or result in
                 the creation or the imposition of any lien, charge or
                 encumbrance upon any property or assets of ______________, the
                 Pass Through Trustee, the Equipment Trust Trustee or the
                 Indenture Trustee, as the case may be, under any indenture,
                 mortgage or other agreement or instrument known to such
                 counsel to which the Pass Through Trustee, the Equipment Trust
                 Trustee or the Indenture Trustee, as the case may be, is a
                 party or by which it or any of its property is bound, or any
                 ___________ or Federal law, rule or regulation governing
                 _______________, the Pass Through Trustee's, the Equipment
                 Trust Trustee's or the Indenture Trustee's banking or trust
                 powers, or of any judgment, order of decree known to such
                 counsel to be applicable to _______________, the Pass Through
                 Trustee, the Equipment Trust Trustee or the Indenture Trustee,
                 as the case may be, of any court, regulatory body,
                 administrative agency, government or governmental body having
                 jurisdiction over ______________, the Pass Through Trustee,
                 the Equipment Trust Trustee or the Indenture Trustee or its
                 respective properties;

                          (v)  no authorization, approval, consent, license or
                 order of, giving of notice to, registration with, or taking of
                 any other action in respect of, any Federal or state
                 governmental authority or agency pursuant to any Federal or
                 ____________ law governing the banking or trust powers of
                 _______________, the Pass Through Trustee, the Equipment Trust
                 Trustee or





                                     - 20 -
   21
                 the Indenture Trustee is required for the authorization,
                 execution, delivery and performance by _____________, (in its
                 individual capacity, to the extent provided therein), the Pass
                 Through Trustee, the Equipment Trust Trustee or the Indenture
                 Trustee of the Indenture, the Participation Agreement, the
                 Equipment Trust Agreements, the Pass Through Trust Agreement
                 and the other Operative Agreements to which it is or will be a
                 party or the consummation of any of the transactions by the
                 Pass Through Trustee, the Equipment Trust Trustee or Indenture
                 Trustee contemplated thereby or the issuance of the Pass
                 Through Certificates under the Pass Through Trust Agreements
                 (except as shall have been duly obtained, given or taken); and
                 such authorization, execution, delivery, performance,
                 consummation and issuance do not conflict with or result in a
                 breach of the provisions of any such law.

In giving such opinion, _________________ (A) may state that no opinion is
expressed as to laws other than the laws of the State of ___________ and the
Federal law of the United States of America, (B) may assume as to the opinions
expressed in clause (ii) relating to any of the Operative Agreements, insofar
as they involve matters relating to the laws of any jurisdiction other than
______________, that such Operative Agreements constitute legal, valid and
binding instruments under such laws and (C) may include such other reasonable
assumptions as are customary in legal opinions delivered in connection with
transactions of this type.

                 (e)      You shall have received from Mayer, Brown & Platt,
         your special counsel, such opinion or opinions, dated the Closing
         Date, with respect to the issuance and sale of the Pass Through
         Certificates, the Pass Through Trust Agreements, the Registration
         Statement, the Prospectus and other related matters as you may
         reasonably require, and the Companies shall have furnished to such
         counsel such documents as they reasonably request for the purpose of
         enabling them to pass upon such matters.

                 (f)      You shall have been furnished with a certificate of
         each of the Companies, signed by the President or any Vice President
         and the principal financial officer of each of the Companies,
         respectively, each dated the Closing Date, to the effect that the
         signers of such certificates have carefully examined the Registration
         Statement, the Prospectus and this Agreement and that:

                          (i)  the representations and warranties of the
                 Companies in this Agreement are true and correct in all
                 material respects on and as of the Closing Date with the same
                 effect as if made on the Closing Date and the Companies have
                 complied with all the agreements and satisfied all the
                 conditions on its part to be performed or satisfied at or
                 prior to the Closing Date;





                                     - 21 -
   22
                          (ii)  no stop order suspending the effectiveness of
                 the Registration Statement has been issued and, to the
                 Companies' knowledge, no proceedings for that purpose have
                 been instituted or threatened; and

                          (iii)  since the date of the most recent financial
                 statements incorporated by reference in the Prospectus, there
                 has been no material adverse change in the condition
                 (financial or other), earnings, business or properties of the
                 Companies and their respective subsidiaries, whether or not
                 arising from transactions in the ordinary course of business,
                 except as set forth in or contemplated in the Prospectus.

                 (g)      The representations and warranties of each of the
         Companies contained in the Equipment Trust Agreements, the
         Participation Agreement, the Lease and the other Operative Agreements
         to which it is a party shall be true and correct in all material
         respects on and as of the Closing Date with the same effect as though
         such representations and warranties had been made on and as of such
         date, and each of the Companies shall have delivered to you a
         certificate, each dated the Closing Date, signed in each case by its
         President or any Vice President and its principal financial or
         accounting officer to the effect that the signers of such certificate
         have carefully examined the Equipment Trust Agreements, the
         Participation Agreement, the Lease and the other Operative Agreements
         to which it is a party, the Registration Statement, the Preliminary
         Prospectus and the Prospectus and that:

                          (i)     the representations and warranties of such
                 Company in the Equipment Trust Agreements, Participation
                 Agreement, the Lease and the other Operative Agreements to
                 which it is a party are true and correct in all material
                 respects on and as of the Closing Date as if made on and as of
                 the Closing Date;

                          (ii)    such Company has complied with all the
                 agreements and satisfied all the conditions on its part to be
                 performed or satisfied on or prior to the Closing Date
                 pursuant to the terms of the Equipment Trust Agreements, the
                 Participation Agreement, the Lease and other Operative
                 Agreements to which it is a party; and

                          (iii)   nothing has come to the attention of such
                 person that would lead him or her to believe that the
                 Registration Statement contains any untrue statement of
                 material fact or omits to state any material fact necessary in
                 order to make the statements therein, in the light of the
                 circumstances under which they were made, not misleading.

                 (h)      At the Execution Time and at the Closing Date, Ernst
         & Young shall have furnished to you a letter or letters, dated,
         respectively, as of the Execution Time





                                     - 22 -
   23
         and as of the Closing Date, in form and substance satisfactory to you,
         confirming that:
  
                          (i)  they are independent auditors within the meaning
                 of the Act and the applicable published rules and regulations
                 thereunder and stating in effect that in their opinion the
                 audited consolidated financial statements and schedules
                 thereto incorporated by reference in the Registration
                 Statement and the Prospectus and reported on by them comply as
                 to form in all material respects with the applicable
                 accounting requirements of the Act and the applicable
                 published rules and regulations thereunder with respect to
                 registration statements on Form S-3; and that nothing came to
                 their attention which caused them to believe that the amounts
                 under the caption "Selected Financial Information" for each of
                 the five years ended December 31, 1995 included in the
                 Registration Statement and the Prospectus, do not agree with
                 the corresponding amounts in the audited financial statements
                 from which such amounts were derived; and as to the periods
                 for which it served as Union's independent auditor, such
                 financial statements were covered by unqualified reports
                 issued by them; and

                          (ii)  they have performed certain other specified
                 procedures as a result of which they determined that certain
                 information of an accounting, financial or statistical nature
                 (which is limited to accounting, financial or statistical
                 information derived from the general accounting records of
                 Union) set forth in the Registration Statement and the
                 Prospectus, including the information set forth under the
                 captions "Selected Financial Information", and in Exhibit 12
                 to the Registration Statement agrees with the accounting
                 records and schedules of the Company and its subsidiaries,
                 excluding any questions of legal interpretation.

                 (i)      In addition, Ernst & Young shall have furnished to
         you a letter or letters, dated, respectively, as of the Execution Time
         and as of the Closing Date, in form and substance satisfactory to you,
         to the effect that on the basis of a reading of the unaudited
         condensed financial statements of Union contained in Union's Quarterly
         Reports on Form 10-Q for the quarter ended March 31, 1996 incorporated
         by reference in the Registration Statement, the amounts set forth
         under the captions "Selected Financial Information" and
         "Capitalization" included in the Registration Statement and the
         Prospectus and of the latest unaudited consolidated financial
         statements made available to them by Union and its subsidiaries;
         carrying out certain specified procedures (but not an audit in
         accordance with generally accepted auditing standards) which would not
         necessarily reveal matters of significance with respect to the
         comments set forth in such letter; a reading of the minutes of the
         meetings of the stockholders, directors and executive committees of
         Union and its subsidiaries; and inquiries of certain officials of
         Union who have responsibility for financial and





                                     - 23 -
   24
         accounting matters of Union and its subsidiaries as to transactions
         and events subsequent to December 31, 1995 nothing came to their
         attention which caused them to believe that (A) the unaudited
         consolidated financial statements of Union incorporated by reference
         in the Registration Statement do not comply as to form in all material
         respects with the applicable accounting requirements of the Act and
         the Exchange Act and the rules and regulations thereunder as they
         apply to Form 10-Q or are not presented in conformity with generally
         accepted accounting principles applied on a basis substantially
         consistent with that of the audited consolidated financial statements
         of Union incorporated by reference in the Registration Statement, and
         (B) with respect to the period subsequent to December 31, 1995, there
         were any changes, at a specified date not more than five business days
         prior to the date of the letter, in the borrowed debt of Union and its
         subsidiaries or capital stock of Union or decreases in the
         stockholder's equity of Union and its subsidiaries as compared with
         the amounts shown on the December 31, 1995, unaudited consolidated
         balance sheet data included in "Selected Financial Information" in the
         Registration Statement and the Prospectus, or for the period from
         December 31, 1995 to such specified date, there were any decreases, as
         compared with the corresponding period in the preceding year, in total
         revenues from net sales and services, or in income before income taxes
         or net income, of Union and its subsidiaries, except in all instances
         for changes or decreases set forth in such letter, in which case the
         letter shall be accompanied by an explanation by Union as to the
         significance thereof unless said explanation is not deemed necessary
         by you.

         References to the Prospectus in paragraphs (h) and (i) include any
         supplement thereto at the date of the letter.

                 (j)      Subsequent to the Execution Time or, if earlier, the
         respective dates as of which information is given in the Registration
         Statement and the Prospectus, there shall not have been (i) any change
         or decrease specified in the letters referred to in paragraphs (g) and
         (h) of this Section 6 or (ii) any change, or any development involving
         a prospective change, in or affecting the business or properties of
         Union and its subsidiaries taken as a whole the effect of which, in
         any case referred to in clause (i) or (ii) above, is, in your
         judgment, so material and adverse as to make it impractical or
         inadvisable to proceed with the public offering or the delivery of the
         Pass Through Certificates as contemplated by the Registration
         Statement and the Prospectus.

                 (k)      Subsequent to the Execution Time and prior to the
         Closing Date, there shall not have occurred any downgrading, nor shall
         any notice have been given of (i) any intended or potential
         downgrading or (ii) any review or possible change in the rating
         accorded Union's debt securities by the Rating Agencies as of the
         Execution Time.





                                     - 24 -
   25
                 (l)      Prior to the Closing Date, the Companies shall have
         furnished to you and the Rating Agencies such further information,
         certificates and documents as you and they may reasonably request.

         If any of the conditions specified in this Section 6 shall not have
been fulfilled in all material respects when and as provided in this Agreement,
or if any of the opinions and certificates mentioned above or elsewhere in this
Agreement shall not be in all material respects reasonably satisfactory in form
and substance to you and your counsel, this Agreement and all your obligations
hereunder may be canceled at, or at any time prior to, the Closing Date by you.
Notice of such cancellation shall be given to the Companies in writing or by
telephone or telegraph confirmed in writing.

         7.      Reimbursement of the Underwriters' Expenses.  If the sale of
the Pass Through Certificates provided for herein is not consummated because
any condition to your obligation set forth in Section 6 hereof is not
satisfied, because of any termination pursuant to Section 9 hereof or because
of any refusal, inability or failure on the part of the Companies to perform
any agreement herein or comply with any provision hereof other than by reason
of a default by you, the Companies will reimburse you upon demand for all
out-of-pocket expenses (including reasonable fees and disbursements of counsel)
that shall have been incurred by you in connection with the proposed purchase
and sale of the Pass Through Certificates.

         8.      Indemnification and Contribution.  (a)  Union agrees to
indemnify and hold harmless you and each person who controls you within the
meaning of either the Act or the Exchange Act from and against any and all
losses, claims, damages or liabilities, joint or several, to which you or any
of them may become subject under the Act, the Exchange Act or other Federal or
state statutory law or regulation, at common law or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise
out of or are based upon any untrue statement or alleged untrue statement of a
material fact contained in the registration statement for the registration of
the Pass Through Certificates as originally filed or in any amendment thereof,
or in any Preliminary Prospectus or the Prospectus, or in any amendment thereof
or supplement thereto, or arise out of or are based upon the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading, and agrees to reimburse you and
each such controlling person for any legal or other expenses reasonably
incurred by you or such controlling person in connection with investigating or
defending any such loss, claim, damage, liability or action; provided, however,
that (i) Union will not be liable in any such case to the extent that any such
loss, claim, damage or liability arises out of or is based upon any such untrue
statement or alleged untrue statement or omission or alleged omission made
therein in reliance upon and in conformity with written information furnished
to the Companies by or on behalf of you specifically for use in connection with
the preparation thereof, and (ii) such indemnity with respect to any
Preliminary Prospectus shall not inure to your benefit (or to the benefit of
any





                                     - 25 -
   26

person controlling you) if the person asserting any such loss, claim, damage or
liability purchased the Pass Through Certificates which are the subject thereof
did not receive a copy or the Prospectus (or the Prospectus as amended or
supplemented) excluding documents incorporated therein by reference at or prior
to the confirmation of the sale of such Pass Through Certificates to such
person in any case where such delivery is required by the Act and the untrue
statement or omission of a material fact contained in such Preliminary
Prospectus was corrected in the Prospectus (or the Prospectus as amended or
supplemented).  This indemnity agreement will be in addition to any liability
which Union may otherwise have.

         (b)     You severally (and not jointly) agree to indemnify and hold
harmless each of the Companies, each of their respective directors, each of
their respective officers who signs the Registration Statement, and each person
who controls the Companies within the meaning of either the Act or the Exchange
Act, to the same extent as the foregoing indemnity from Union to you, but only
with reference to written information relating to you furnished to the
Companies by or on behalf of you specifically for use in preparation of the
documents referred to in clause (a) of this Section 8.  This indemnity
agreement will be in addition to any liability which you may otherwise have.
The Companies acknowledge that the statements set forth in the last paragraph
of the cover page and under the heading "Underwriting" in any Preliminary
Prospectus and the Prospectus and the stabilization language included on the
inside front cover of any Preliminary Prospectus and the Prospectus constitute
the only information furnished in writing by or on behalf of you for inclusion
in any Preliminary Prospectus or the Prospectus, and you confirm that such
statements are correct.

         (c)     Promptly after receipt by an indemnified party under this
Section 8 of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against the indemnifying
party under this Section 8, notify the indemnifying party in writing of the
commencement thereof; but the omission so to notify the indemnifying party will
not relieve it from any liability which it may have to any indemnified party
otherwise than under this Section 8.  In case any such action is brought
against any indemnified party, and the indemnified party notifies the
indemnifying party of the commencement thereof, the indemnifying party will be
entitled to appoint counsel satisfactory to such indemnified party to represent
the indemnified party in such action; provided, however, if the defendants in
any such action include both the indemnified party and the indemnifying party
and the indemnified party shall have reasonably concluded that there may be
legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party, the
indemnified party or parties shall have the right to select separate counsel to
assert such legal defenses and to otherwise participate in the defense of such
action on behalf of such indemnified party or parties.  Upon receipt of notice
from the indemnifying party to such indemnified party of the indemnifying
party's election so to assume the defense of such action and approval by the
indemnified party of counsel, the indemnifying party will not be liable to such
indemnified





                                     - 26 -
   27
party under this Section 8 for any legal or other expenses subsequently
incurred by such indemnified party in connection with the defense thereof
unless (i) the indemnified party shall have employed separate counsel in
connection with the assertion of legal defenses in accordance with the proviso
to the next preceding sentence (it being understood, however, that the
indemnifying party shall not be liable for the expenses of more than one
separate counsel, approved by you in the case of subparagraph (a), representing
the indemnified parties under subparagraph (a) who are parties to such action),
(ii) the indemnifying party shall not have employed counsel satisfactory to the
indemnified party to represent the indemnified party within a reasonable time
after notice of commencement of the action or (iii) the indemnifying party has
authorized the employment of counsel for the indemnified party at the expense
of the indemnifying party; and except that, if clause (i) or (iii) is
applicable, such liability shall be only in respect of the counsel referred to
in such clause (i) or (iii).

         (d)     In order to provide for just and equitable contribution in
circumstances in which the indemnification provided for in paragraph (a) of
this Section 8 is due in accordance with its terms but is for any reason held
by a court to be unavailable from Union on grounds of policy or otherwise,
Union and you shall contribute to the aggregate losses, claims, damages and
liabilities (including legal or other expenses reasonably incurred in
connection with investigating or defending same) to which Union and you may be
subject in such proportion so that each of you are responsible only for that
portion represented by the percentage that the aggregate underwriting
commission in respect of the Pass Through Certificates appearing on the cover
page of the Prospectus attributable to Pass Through Certificates sold by you
bears to the aggregate public offering price in respect of such Pass Through
Certificates appearing thereon and Union is responsible for the balance;
provided, however, that (y) in no case shall you be responsible for any amount
in excess of such respective underwriting commissions and (z) no person guilty
of fraudulent misrepresentation (within the meaning of Section 11(f) of the
Act) shall be entitled to contribution from any person who was not guilty of
such fraudulent misrepresentation.  For purposes of this Section 8, each person
who controls you within the meaning of the Act shall have the same rights to
contribution as you, and each person who controls the Companies within the
meaning of the Act, each officer of the Companies who shall have signed the
Registration Statement and each director of the Companies shall have the same
rights to contribution as the Companies, subject in each case to clauses (y)
and (z) of this paragraph (d).  Any party entitled to contribution will,
promptly after receipt of notice of commencement of any action, suit or
proceeding against such party in respect of which a claim for contributions may
be made against another party or parties under this paragraph (d), notify such
party or parties from whom contribution may be sought, but the omission to so
notify such party or parties shall not relieve the party or parties from whom
contribution may be sought from any other obligation it or they may have
hereunder or otherwise than under this paragraph (d).

         9.      Termination.  This Agreement shall be subject to termination
in your absolute discretion by notice given to the Companies prior to delivery
of and payment for the Pass





                                     - 27 -
   28
Through Certificates, if prior to such time (i) trading in securities generally
on the New York Stock Exchange shall have been suspended or limited or minimum
prices shall have been established on such Exchange, (ii) a banking moratorium
shall have been declared either by Federal, New York State or ___________ State
authorities or (iii) there shall have occurred any outbreak or material
escalation of hostilities or other calamity or crisis the effect of which on
the financial markets of the United States is such as to make it, in your
judgment, impracticable to market the Pass Through Certificates.

         10.     Representations and Indemnities to Survive.  The respective
agreements, representations, warranties, indemnities and other statements of
the Companies or their respective officers and of you set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation made by or on behalf of you or the Companies or any of their
respective officers, directors or controlling persons referred to in Section 8
hereof, and will survive delivery of and payment for the Pass Through
Certificates.  The provisions of Sections 7 and 8 hereof shall survive the
termination or cancellation of this Agreement.

         11.     Notices.  All communications hereunder will be in writing and
effective only on receipt, and, if sent to you, will be mailed, delivered or
telegraphed and confirmed in the case of Solomon Brothers Inc at 7 World Trade
Center, New York, New York 10048, Attention:  Legal Department; in the case of
Morgan Stanley & Co. Incorporated at 1251 Avenue of the Americas, New York, New
York  10020, Attention:  Legal Department; or, if sent to the Companies, will
be mailed, delivered or telegraphed and confirmed to it at 225 West Washington
Street, Chicago, Illinois 60606, Attention: Secretary and to Procor at 2001
Speers Road, Oakville, Ontario, Canada L6J 5E1, Attention:  President.

         12.     Successors.  This Agreement will inure to the benefit of and
be binding upon the parties hereto and their respective successors and the
officers and directors and controlling persons referred to in Section 8 hereof,
and no other person will have any right or obligation hereunder.

         13.     Applicable Law.  This Agreement will be governed by and
construed in accordance with the laws of the State of New York.





                                     - 28 -
   29
         If the foregoing is in accordance with your understanding of our
agreement, please sign and return to us the enclosed duplicate hereof,
whereupon this letter and your acceptance shall represent a binding agreement
among the Company, Procor and you.

                                           Very truly yours,

                                           UNION TANK CAR COMPANY



                                           By                                  
                                             ----------------------------------
                                              Name:
                                              Title:

                                           PROCOR LIMITED



                                           By                                  
                                             -----------------------------------
                                              Name:
                                              Title:


The foregoing Agreement is
hereby confirmed and accepted as of the
date first written above.

SALOMON BROTHERS INC
MORGAN STANLEY & CO. INCORPORATED


By SALOMON BROTHERS INC
  Acting on behalf of itself and
  Morgan Stanley & Co. Incorporated



By
   --------------------------
    Name:
    Title:





                                     - 29 -
   30
                                                                      Schedule A







Pass Through                  Principal                                               Final Distribution
Certificate                    Amount                   Interest Rates                        Dates

                                                                                
1996-A1                      $___________                  ____%                          ______________

1996-A2                      $___________                  ____%                          _______________







   31
                                                                      Schedule B







                                     Pass Through Certificate               Pass Through Certificate
                                         Series 1996 - A1                       Series 1996 - A2
                                        Aggregate Principal                   Aggregate Principal
                                              Amount                                 Amount
                                                                                                           
                                 --------------------------------   ---------------------------------------
                                                              
 Salomon Brothers Inc
 Morgan Stanley & Co.
 Incorporated

          Total