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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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                                   SCHEDULE TO
                                 (Rule 14d-100)
                  Tender Offer Statement Under Section 14(d)(1)
           or Section 13(e)(1) of the Securities Exchange Act of 1934
                                (Amendment No. 4)

                          MOTOR CARGO INDUSTRIES, INC.
                       (Name of Subject Company (Issuer))

                            UNION PACIFIC CORPORATION
                       (Names of Filing Persons (Offeror))

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                           Common Stock, No Par Value
                         (Title of Class of Securities)

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                                    619907108
                      (CUSIP Number of Class of Securities)

                               Carl W. von Bernuth
                     Senior Vice President, General Counsel
                                  and Secretary
                            Union Pacific Corporation
                                1416 Dodge Street
                                 Omaha, NE 68179
                                 (402) 271-5777

            (Name, address and telephone number of person authorized
       to receive notices and communications on behalf of filing persons)
                                 With a copy to:

                              Paul T. Schnell, Esq.
                            Richard J. Grossman, Esq.
                    Skadden, Arps, Slate, Meagher & Flom LLP
                                Four Times Square
                               New York, NY 10036
                             Telephone: 212-735-3000

[__] Check the box if the filing relates solely to preliminary communications
     made before the commencement of a tender offer. Check the appropriate boxes
     below to designate any transactions to which the statement relates:

              [ X ]   third-party tender offer subject to Rule 14d-1.
              [__]    issuer  tender offer subject to Rule 13e-4.
              [__]    going-private transaction subject to Rule 13e-3.
              [__]    amendment to Schedule 13D under Rule 13d-2.

              Check the following box if the filing is a final amendment
              reporting the results of the tender offer: [__]

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                         Amendment No. 4 to Schedule TO
                         ------------------------------

         This Amendment No. 4 to the Tender Offer Statement on Schedule TO (the
"Schedule TO"), filed initially with the Securities and Exchange Commission on
October 31, 2001, and amended by Amendment No. 1 thereto filed November 13,
2001, Amendment No. 2 thereto filed November 19, 2001 and Amendment No. 3
thereto filed November 26, 2001, relates to the offer by Union Pacific
Corporation, a Utah corporation ("Union Pacific") to exchange each outstanding
share of common stock of Motor Cargo Industries, Inc. ("Motor Cargo"), no par
value (collectively, the "Shares"), for either (i) 0.26 of a share of common
stock, par value $2.50 per share, of Union Pacific ("Union Pacific Stock"), or
(ii) $12.10 in cash, at the election of the holder of each Share and upon the
terms and subject to the conditions set forth in the Preliminary Prospectus,
dated October 31, 2001, as amended on November 19, 2001, November 26, 2001 and
November 28, 2001 (the "Preliminary Prospectus"), and in the related Letter of
Election and Transmittal, copies of which were filed as Exhibits (a)(10) and
(a)(2) respectively to the Schedule TO (the Letter of Election and Transmittal
together with the Preliminary Prospectus, as each may be amended or supplemented
from time to time, collectively constitute the "Offer"). Capitalized terms used
herein but not defined herein shall have the meanings ascribed to them in the
Preliminary Prospectus.

Item 12. Exhibits.

(a)(11)  Preliminary Prospectus, dated November 28, 2001, is incorporated herein
         by reference from Union Pacific's Amendment No. 3 to the Registration
         Statement on Form S-4 filed on October 31, 2001, as amended on November
         19, 2001, November 26, 2001 and November 28, 2001.

                                    SIGNATURE

              After due inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

                                      UNION PACIFIC CORPORATION

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

Dated: November 28, 2001

                                  EXHIBIT INDEX

         Exhibit No.                            Exhibit Name
         -----------                            ------------

            (a)(1)           Preliminary Prospectus, dated October 31, 2001,
                             is incorporated herein by reference from Union
                             Pacific's Registration Statement on Form S-4
                             filed on October 31, 2001.

            (a)(2)           Letter of Election and Transmittal is
                             incorporated herein by reference to Exhibit 99.3
                             to Union Pacific's Registration Statement on
                             Form S-4 filed on October 31, 2001.

            (a)(3)           Notice of Guaranteed Delivery is incorporated
                             herein by reference to Exhibit 99.4 to Union
                             Pacific's Registration Statement on Form S-4
                             filed on October 31, 2001.

            (a)(4)           Letter to Brokers, Dealers, Commercial Banks,
                             Trust Companies and Other Nominees is
                             incorporated herein by reference to Exhibit 99.5
                             to Union Pacific's Registration Statement on
                             Form S-4 filed on October 31, 2001.

            (a)(5)           Letter to Clients for use by Brokers, Dealers,
                             Commercial Banks, Trust Companies and Other
                             Nominees is incorporated herein by reference to
                             Exhibit 99.6 to Union Pacific's Registration
                             Statement on Form S-4 filed on October 31, 2001.

            (a)(6)           Guidelines for Certification of Taxpayer
                             Identification Number on Substitute Form W-9 is
                             incorporated herein by reference to Exhibit 99.7
                             to Union Pacific's Registration Statement on
                             Form S-4 filed on October 31, 2001.

            (a)(7)           Joint Press Release issued by Union Pacific and
                             Motor Cargo on October 15, 2001 is incorporated
                             herein by reference to Exhibit 99.1 to Union
                             Pacific's Current Report on Form 8-K filed on
                             October 16, 2001.

            (a)(8)           Joint Press Release issued by Union Pacific and
                             Motor Cargo on October 31, 2001 is incorporated
                             herein by reference to Exhibit (a)(8) to Union
                             Pacific's Tender Offer Statement on Schedule TO
                             filed on October 31, 2001.

            (a)(9)           Preliminary Prospectus, dated November 19, 2001,
                             is incorporated herein by reference from Union
                             Pacific's Amendment No. 1 to the Registration
                             Statement on Form S-4 filed on October 31, 2001,
                             as amended on November 19, 2001.

           (a)(10)           Preliminary Prospectus, dated November 26, 2001,
                             is incorporated herein by reference from Union
                             Pacific's Amendment No. 2 to the Registration
                             Statement on Form S-4 filed on October 31, 2001,
                             as amended on November 19, 2001 and November 26,
                             2001.

           (a)(11)           Preliminary Prospectus, dated November 28, 2001,
                             is incorporated herein by reference from Union
                             Pacific's Amendment No. 3 to the Registration
                             Statement on Form S-4 filed on October 31, 2001,
                             as amended on November 19, 2001, November 26,
                             2001 and November 28, 2001.

            (d)(1)           Agreement and Plan of Merger, dated as of
                             October 15, 2001, by and among Motor Cargo
                             Industries, Inc., Union Pacific Corporation and
                             Motor Merger Co. is incorporated by reference to
                             Exhibit 99.2 to Union Pacific's Current Report
                             on Form 8-K filed on October 16, 2001.

            (d)(2)           Shareholder Agreement, dated as of October 15,
                             2001, by and between Union Pacific Corporation
                             and Harold R. Tate is incorporated herein by
                             reference to Exhibit 99.2 to Union Pacific's
                             Current Report on From 8-K filed on October 16,
                             2001.

            (d)(3)           Shareholder Agreement, dated as of October 15,
                             2001, by and between Union Pacific Corporation
                             and Marvin L. Friedland is incorporated herein
                             by reference to Exhibit 99.3 to Union Pacific's
                             Current Report on From 8-K filed on October 16,
                             2001.

             (g)             Not applicable.

             (h)             Not applicable.