SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                                SCHEDULE 14D-1
           Tender Offer Statement Pursuant to Section 14(d)(l) of 
                     the Securities Exchange Act of 1934
                              (Amendment No. 4)
                                     and
                                 SCHEDULE 13D
                  under the Securities Exchange Act of 1934
                              (Amendment No. 4)

                      Southern Pacific Rail Corporation
                          (Name of Subject Company)

                          Union Pacific Corporation
                          UP Acquisition Corporation
                        Union Pacific Railroad Company       
                                  (Bidders)

                    Common Stock, Par Value $.001 Per Share     
                        (Title of class of securities)

                                 843584 10 3                  
                     (CUSIP number of class of securities)

                           Richard J. Ressler, Esq.
                          Assistant General Counsel
                          Union Pacific Corporation
                    Martin Tower, Eighth and Eaton Avenues
                        Bethlehem, Pennsylvania  18018
                               (610) 861-3200                     
           (Name, address and telephone number of person authorized
          to receive notices and communications on behalf of bidders)

                               with a copy to:

                            Paul T. Schnell, Esq.
                     Skadden, Arps, Slate, Meagher & Flom
                               919 Third Avenue
                          New York, New York  10022
                           Telephone: (212)735-3000


                    This Amendment No. 4 amends and supplements the
          Tender Offer Statement on Schedule 14D-1 relating to the
          tender offer by UP Acquisition Corporation ("Purchaser"),
          a Delaware corporation and a wholly owned subsidiary of
          Union Pacific Railroad Company, a Utah corporation
          ("UPRR"), and an indirect wholly owned subsidiary of
          Union Pacific Corporation, a Utah corporation ("Parent"),
          to purchase up to 39,034,471 shares of Common Stock, par
          value $.001 per share (the " Shares"), of Southern
          Pacific Rail Corporation, a Delaware corporation (the
          "Company").

               Unless otherwise indicated herein, each capitalized
          term used and not defined herein shall have the meaning
          assigned to such term in the Schedule 14D-1 or in the
          Offer to Purchase referred to therein.

          ITEM 7.   CONTRACTS, ARRANGEMENTS, UNDERSTANDING OR
                    RELATIONSHIPS WITH RESPECT TO THE SUBJECT
                    COMPANY'S SECURITIES.

          ITEM 10.  ADDITIONAL INFORMATION.

               The information set forth in Items 7, 10(b), 10(c)
          and 10(e) of the Schedule 14D-1 is hereby amended and
          supplemented by the following information:

               On August 25, 1995, Parent issued a press release
          announcing that Parent had received an informal written
          opinion from the staff of the ICC authorizing the use of
          a voting trust in connection with the Offer.  A copy of
          such press release is attached hereto as Exhibit (a)(12)
          and incorporated herein by reference.

          ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.

          (a)(12)   Text of Press Release issued by Parent on
                    August 25, 1995.


                                  SIGNATURE

               After due inquiry and to the best of its knowledge
          and belief, the undersigned certifies that the
          information set forth in this statement is true, complete
          and correct.

          Dated:  August 28, 1995  UNION PACIFIC CORPORATION

                                   By: /s/ Carl W. von Bernuth      
                                       Name: Carl W. von Bernuth   
                                       Title: Senior Vice President 
                                              and General Counsel


                                  SIGNATURE

               After due inquiry and to the best of its knowledge
          and belief, the undersigned certifies that the
          information set forth in this statement is true, complete
          and correct.

          Dated:  August 28, 1995  UP ACQUISITION CORPORATION

                                   By: /s/ Carl W. von Bernuth      
                                       Name: Carl W. von Bernuth
                                       Title: Vice President and    
                                              Assistant Secretary


                                  SIGNATURE

               After due inquiry and to the best of its knowledge
          and belief, the undersigned certifies that the
          information set forth in this statement is true, complete
          and correct.

          Dated:  August 28, 1995  UNION PACIFIC RAILROAD COMPANY

                                   By: /s/ Carl W. von Bernuth      
                                       Name: Carl W. von Bernuth
                                       Title: Senior Vice President 
                                              and General Counsel


                                EXHIBIT INDEX

          Exhibit                  Description

          (a)(12)        Text of Press Release issued by Parent on
                         August 25, 1995.



          UNION PACIFIC LOGO
                                        NEWS RELEASE

                                        Contact:  610-861-3388
                                        Harvey S. Turner
                                        Director-Public Relations
                                        Martin Tower
                                        Eighth and Eaton Avenues
                                        Bethlehem, PA  18018

                                        FOR IMMEDIATE RELEASE

                  ICC APPROVES UNION PACIFIC VOTING TRUST
        BETHLEHEM, PA, AUGUST 25 -- Union Pacific Corporation (NYSE:
        UNP) today received an informal written opinion from the staff
        of the Interstate Commerce Commission authorizing the use of a
        voting trust in its previously announced tender offer for
        shares of Southern Pacific Rail Corporation (NYSE:  RSP).