Penn National Gaming, Inc., as Company,

                 each of the Subsidiary Guarantors named herein

                                       and

                      State Street Bank and Trust Company,

                                     Trustee

                           ___________________________


                          FIRST SUPPLEMENTAL INDENTURE


                            Dated as of May 19, 1999



            Supplementing the Indenture Dated as of December 17, 1997



                           ___________________________



                                   $80,000,000

                     10 5/8% Senior Notes due 2004, Series B







                                      180




     FIRST  SUPPLEMENTAL  INDENTURE,  dated  as of May 19,  1999,  between  Penn
National Gaming, Inc., a Pennsylvania  corporation (the "Company"),  each of the
Subsidiary  Guarantors that are signatories to this  Supplemental  Indenture and
State Street Bank and Trust Company, as trustee (the "Trustee").

     WHEREAS,  the Company and the Trustee  executed and delivered  that certain
indenture,  dated as of December 17, 1997 (the  "Indenture"),  providing for the
issuance  thereunder by the Company,  and the authentication and delivery by the
Trustee,  of the  Company's  10 5/8% Senior  Notes due 2004 (the  "Notes").  Any
capitalized  terms used herein and not otherwise defined shall have the meanings
given thereto in the Indenture.

     WHEREAS,  Section  9.02 of the  Indenture  authorizes  the  Company and the
Trustee,  with the  consent of the  holders  of not less than a majority  in the
aggregate principal amount of then outstanding Notes excluding Notes held by the
Company  and  its  affiliates  (the  "Requisite  Consent"),   to  enter  into  a
supplemental  indenture,  except for the  matters  listed in Section  9.02 which
require the consent of each of the Holders effected thereby.

     WHEREAS,  the Company has solicited all registered holders of record of the
Notes as of the  close of  business  on May 7,  1999 and  obtained  at least the
Requisite Consent of such holders.

     WHEREAS,  the  Company  and  the  Trustee  have  determined  to  amend  and
supplement  the  Indenture  in the  manner  described  below,  and all  acts and
proceedings  required by law and by the  Indenture  necessary to  authorize  and
constitute this Supplemental  Indenture,  and the amendments set forth herein, a
valid and binding agreement in accordance with the terms hereof,  have been done
and taken.

     WHEREAS,  the Company has formed Penn  National  GSFR,  Inc.,  a New Jersey
corporation and wholly-owned Restricted Subsidiary of the Company (AGSFR@);

     WHEREAS,  following  the  execution  of this  Supplemental  Indenture,  the
Company  expects  GSFR to have total  consolidated  assets  with a book value in
excess of $500,000;

     WHEREAS,  consistent  with the provisions of Section 4.18 of the Indenture,
GSFR shall herein execute and deliver this  Supplemental  Indenture for purposes
of becoming a Subsidiary Guarantor under the Indenture;

     NOW,  THEREFORE,  in consideration of the foregoing,  the Company covenants
and agrees  with the  Trustee,  for the equal and  proportionate  benefit of the
respective holders from time to time of the Notes, as follows:

     1.  Modification or Addition of Certain  Definitions in Section 1.01 of the
Indenture.  The  following  definitions  are hereby added to Section 1.01 of the
Indenture:

                                      181




     AContingent  Notes@ means the (i) $5,000,000  Contingent  Promissory  Note,
(ii)  $3,000,000  Contingent  Promissory  Note and (iii)  $2,000,000  Contingent
Promissory  Note, each (w) dated January 28, 1999, (x) made payable to the order
of International Thoroughbred Breeders, Inc., a Delaware corporation,  as agent,
(y)  executed  and  delivered  by GS Park  Racing,  L.P.,  a New Jersey  limited
partnership, and FR Park Racing, L.P., a New Jersey limited partnership, and (z)
as in effect on such date,  and any  Refinancings  thereof of (i), (ii) or (iii)
(provided that such  Refinancing  does not have any of the results  specified in
clause (1) of the definition herein of ARefinancing Indebtedness@).

     ADevelopment  Costs@  means  the costs to the NJ  Entities  to  develop  or
further develop NJ Racing or Gaming Locations incurred after May 19, 1999.

     A40%-Owned  Entity@  means (i) any  corporation  of which  the  outstanding
Capital  Stock  having  at least  40% of the  votes  entitled  to be cast in the
election of directors under ordinary  circumstances  shall at the time be owned,
directly or indirectly,  by the Company or a Wholly-Owned Restricted Subsidiary,
or (ii) any  other  Person of which as least 40% of the  voting  interest  under
ordinary  circumstances  is at the time,  directly or  indirectly,  owned by the
Company or a Wholly-Owned Restricted Subsidiary.

     AGarden State Park Lease@ means the Lease  Agreement dated January 28, 1999
between  Garden  State Race Track,  Inc., a New Jersey  corporation  and GS Park
Racing,  L.P.,  a  New  Jersey  limited  partnership,  and  all  amendments  and
supplements  thereto that do not increase or result in an increase in the rental
or other financial  obligations of GS Park Racing,  L.P. or any other NJ Entity,
pertaining to the lease by GS Park Racing,  L.P. of the premises known as Garden
State Park in Cherry Hill, New Jersey.

     ANJ Entities@ means Pennwood Racing, Inc., a Delaware corporation,  GS Park
Racing,  L.P., a New Jersey  limited  partnership,  FR Park Racing,  L.P., a New
Jersey limited partnership, GS Services, L.P., a New Jersey limited partnership,
FR  Services,  L.P.,  a New  Jersey  limited  partnership,  and  each  of  their
subsidiaries,  affiliates,  successors and assigns,  in each case, if and for so
long as such Person is and remains at least a 40%-Owned Entity.

     ANJ Racing and  Gaming  Activities@  means the  purchase,  improvement  and
operation  (including,  but not  limited  to, any  expanded  operations  such as
telephone wagering and off-track  wagering) of the NJ Racing or Gaming Locations
by the NJ Entities.

     ANJ Racing or Gaming  Locations@  means Freehold  Raceway in Freehold,  New
Jersey and Garden State Park in Cherry Hill, New Jersey and such other locations
within the State of New Jersey owned, leased or operated,  now or hereafter,  by
the NJ Entities.

                                      182



    APut Agreement@ means the Subordination, Nondisturbance, Attornment and Put
Option  Agreement  dated  January 28, 1999,  between  Credit Suisse First Boston
Mortgage Capital LLC, a Delaware limited liability company,  and GS Park Racing,
L.P., a New Jersey limited partnership, as in effect on such date.

     APut  Obligations@  means the  obligations  of GS Park Racing,  L.P., a New
Jersey limited partnership, under Section 5 of the Put Agreement.

     2. Amendment of the definition of APermitted  Investments@.  The definition
of APermitted  Investments@ as contained within Section 1.01 of the Indenture is
hereby  amended by (i) deleting the word Aand@ and replacing it with a semicolon
before  clause (x),  (ii)  replacing the period at the end of clause (x) with A;
and@ and (iii) adding a new clause (xi) to such term as follows:

     (xi)  any  Investment  in the NJ  Entities  for the NJ  Racing  and  Gaming
Activities at the NJ Racing or Gaming  Locations (A) in an aggregate  Investment
amount (including the principal amount of Indebtedness guaranteed as provided by
clause (xv) of the  definition of Permitted  Indebtedness)  not to exceed at any
one time  outstanding:  (1) $8.75  million  to fund (or to  replenish  moneys or
liquidity used to fund) up to one-half of the Put Obligations, (2) $5 million to
fund (or to  replenish  moneys  or  liquidity  used to fund) up to  one-half  of
Contingent  Note principal  payments and (3) $4 million to fund (or to replenish
moneys or liquidity used to fund) Development Costs; provided, however, that the
amounts  under the  foregoing  clauses  (1),  (2) and (3) shall be  reduced on a
dollar  for  dollar  basis by the amount of any  guarantee  of Put  Obligations,
Contingent  Notes or  Development  Costs,  respectively,  of the  Company or any
Restricted  Subsidiary on behalf of the NJ Entities  that  subsequent to May 19,
1999,  expires or terminates  without the Company or any  Restricted  Subsidiary
having advanced, paid or contributed to the NJ Entities or guarantee beneficiary
any amounts with respect to such obligations,  and (B) consisting of a guarantee
of the obligations of GS Park Racing, L.P. under the Garden State Park Lease.

     3. Amendment of the definition of APermitted Indebtedness@.  The definition
of APermitted Indebtedness@ as contained within Section 1.01 of the Indenture is
hereby  amended by (i) deleting the word Aand@ and replacing it with a semicolon
before clause (xiv),  (ii)  replacing the period at the end of clause (xiv) with
A; and@ and (iii) adding a new clause (xv) to such term as follows:


                                       183


     (xv) any  Indebtedness  (A) of the  Company  or any  Restricted  Subsidiary
consisting  of the  guarantees  of  Indebtedness  of the NJ Entities  for the NJ
Racing and Gaming  Activities at the NJ Racing or Gaming  Locations in an amount
not to  exceed  at any one time  outstanding:  (1)  $8.75  million  or  one-half
(whichever is less) of outstanding Put  Obligations,  (2) $5 million or one-half
(whichever  is less) of the  outstanding  principal  balance  of the  Contingent
Notes,  and (3) $4 million of Development  Costs;  provided,  however,  that the
amounts  under the  foregoing  clauses  (1),  (2) and (3) shall be  reduced on a
dollar for dollar  basis by the amount of any  Investment  by the Company or any
Restricted  Subsidiary in any NJ Entities made (x) under  subclause  (1), (2) or
(3)  (respectively)  of  clause  (xi) of the  definition  herein  of  APermitted
Investments@ or (y) under Section 4.10 for purposes  described in such subclause
(1),  (2) or  (3)  (respectively),  or  (B)  consisting  of a  guarantee  of the
obligations of GS Park Racing, L.P. under the Garden State Park Lease.

     4.  Amendment of the  definition of APermitted  Liens@.  The  definition of
APermitted  Liens@ as contained  within  Section 1.01 of the Indenture is hereby
amended by (i) deleting the word Aand@ and replacing it with a semicolon  before
clause (xv),  (ii)  replacing  the period at the end of clause (xv) with A; and@
and (iii) adding a new clause (xvi) to such term as follows:

     (xvi) any Liens on the capital stock of or other ownership interests in the
NJ  Entities  held  by  the  Company  or any  Restricted  Subsidiary  to  secure
Indebtedness of the NJ Entities not prohibited hereunder.

     5.  Amendment to the Obligation to become a Subsidiary  Guarantor.  Section
4.18 of the Indenture is hereby amended to add a new sentence at the end of this
section as follows:

     The  provisions of this Section 4.18 shall only apply to a NJ Entity in the
event such NJ Entity becomes a Wholly Owned Restricted Subsidiary.

     6. Addition of GSFR as a Subsidiary Guarantor.  Pursuant to Section 4.18 of
the  Indenture,  GSFR  hereby  agrees to  unconditionally  guarantee  all of the
Company=s  obligations  under the Notes and the  Indenture,  as amended,  on the
terms set forth in the Indenture.

     7. Full Force and Effect.  The Indenture,  as amended and  supplemented  by
this First Supplemental Indenture,  shall be and remain in full force and effect
as of the date hereof; provided, however, in the event that the Company does not
acquire an ownership  interest in the NJ Entities,  the  amendments set forth in
Sections 1, 2, 3, 4, 5 and 6 of this First Supplemental Indenture shall cease to
have  effect  and  shall be void and this  First  Supplemental  Indenture  shall
thereupon have no effect on the Indenture.

     8. Governing Law. This First  Supplemental  Indenture  shall be governed by
and construed in accordance with the laws of the State of New York.

     9. Duplicate Originals.  This First Supplemental  Indenture may be executed
in  any  number  of   counterparts   and  by  the  parties  hereto  in  separate
counterparts,  each of which when so executed  shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.


                                       184


     10.  Trustee  Disclaimer.  The Trustee has  accepted  the  amendment of the
Indenture  effected by this First  Supplemental  Indenture and agrees to execute
the trust  created by the Indenture as hereby  amended,  but only upon the terms
and conditions  set forth in the  Indenture,  including the terms and provisions
defining and limiting the liabilities and  responsibilities of the Trustee,  and
without  limiting the  generality  of the  foregoing,  the Trustee  shall not be
responsible in any manner  whatsoever for or with respect to any of the recitals
or statements  contained  herein,  all of which  recitals or statements are made
solely by the Company and the Subsidiary  Guarantors,  or for or with respect to
(a) the validity or sufficiency of this First  Supplemental  Indenture or any of
the terms or  provisions  hereto,  (b) the  proper  authorization  hereby by the
Company and the Subsidiary Guarantors by corporate action or otherwise,  (c) the
due  execution  hereof by the Company  and the  Subsidiary  Guarantors,  (d) the
consequences  (direct or indirect and whether  deliberate or inadvertent) of any
amendment  herein  provided  for, and the Trustee makes no  representation  with
respect  to any  such  matters  and  (e)  the  validity  or  sufficiency  of the
Solicitation  or the consent  solicitation  materials or procedure in connection
therewith.

     IN WITNESS WHEREOF,  the parties hereto have caused this First Supplemental
Indenture to be duly executed as of the date first written above.


             COMPANY:
             PENN NATIONAL GAMING, INC.

             By: /s/ William J. Bork
                 Name: William J. Bork
                 Title:    President


             SUBSIDIARY GUARANTORS

             MOUNTAINVIEW THOUROUGHBRED RACING
                ASSOCIATION, as Subsidiary Guarantor

             By: /s/ Robert S. Ippolito
                 Name: Robert S. Ippolito
                 Title:   Chief Financial Officer


             PENNSYLVANIA NATIONAL TURF CLUB, INC.,
                as Subsidiary Guarantor

             By: /s/ Robert S. Ippolito
                 Name: Robert S. Ippolito
                 Title:   Treasurer

                                      185


        PENN NATIONAL SPEEDWAY, INC.,
            as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        PENN NATIONAL HOLDING COMPANY,
            as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        PENN NATIONAL GAMING OF WEST VIRGINIA,
           INC., as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        STERLING AVIATION INC., as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        POCONO DOWNS, INC., as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Assistant Secretary


        NORTHEAST CONCESSIONS, INC.,
            as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Assistant Secretary

                                      186



        THE DOWNS OFF-TRACK WAGERING, INC.,
           as Subsidiary Guarantor

        By: /s/ Joseph A. Lashinger
            Name:  Joseph A. Lashinger
            Title:   President and Treasurer


        THE DOWNS RACING, INC., as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        PENN NATIONAL GAMING OF INDIANA,
           as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        PNGI POCONO, as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer


        PENN NATIONAL GSFR, INC., as Subsidiary Guarantor

        By: /s/ Robert S. Ippolito
            Name: Robert S. Ippolito
            Title:   Treasurer

        TRUSTEE:

        STATE STREET BANK AND TRUST COMPANY,
        as Trustee


        By: /s/ Mark A. Forgetta
            Name:  Mark A. Forgetta
            Title:    Vice President
                                      187