SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D



                    Under the Securities Exchange Act of 1934



                          Marine Transport Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, par value $.50
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   567912 10 0
             ------------------------------------------------------
                                 (CUSIP Number)


   Louis J. Bevilacqua, Esq., Cadwalader, Wickersham & Taft, 100 Maiden Lane,
                               New York, NY 10038
                                 (212) 504-6000
- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                  June 18, 1998
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             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule 13d-1(e),  Rule 13d-1(f) or Rule  13d-1(g),  check the
following box /_/.

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all  exhibits.  See Rule 13d-7(b) for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

CUSIP NO. 567912 10 0.
          -----------



                                  SCHEDULE 13D

CUSIP NO. 567912 10 0.                                        
          -----------


1       NAME OF REPORTING PERSON  
        Richard T. du Moulin
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

- ------- ------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
        (See Instructions)(a) |_| (b) |X|

- ------- ------------------------------------------------------------------------
3       SEC USE ONLY

- ------- ------------------------------------------------------------------------
4       SOURCE OF FUNDS (See Instructions)
        00

- ------- ------------------------------------------------------------------------
5       CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
        TO ITEMS 2(d) or 2(e)  |_|

- ------- ------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION
        United States

- --------------------- ------ ---------------------------------------------------
                      7      SOLE VOTING POWER
                             511,773

                      ------ ---------------------------------------------------
     NUMBER OF        8      SHARED VOTING POWER
       SHARES                6,808
    BENEFICIALLY
      OWNED BY
        EACH
     REPORTING        ------ ---------------------------------------------------
       PERSON         9      SOLE DISPOSITIVE POWER
        WITH                 511,773
             
                      ------ ---------------------------------------------------
                      10     SHARED DISPOSITIVE POWER
                             6,808

- ------- ------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        518,581

- ------- ------------------------------------------------------------------------
12      CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 
        (See Instructions) |_|

- ------- ------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        9.24%

- ------- ------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON (See Instructions)
        IN




Item 1.  Security and Issuer.

     This statement  relates to shares of common stock, $.50 par value per share
(the "Common  Stock"),  of Marine Transport  Corporation,  formerly known as OMI
Corp. (the  "Corporation").  The  Corporation's  principal  executive  office is
located at 1200 Harbor Boulevard, Weehawken, New Jersey 07087.

Item 2.  Identity and Background.

     (a)  This statement is being filed by Richard T. du Moulin (the  "Reporting
          Person").

     (b)  The business  address of the  Reporting  Person is:  Marine  Transport
          Corporation, 1200 Harbor Boulevard, Weehawken, New Jersey 07087.

     (c)  The Reporting  Person's  present  principal  occupation is:  Chairman,
          President and Chief Executive Officer of Marine Transport Corporation,
          a Delaware  corporation,  with a  principal  place of business at 1200
          Harbor Boulevard, Weehawken, New Jersey 07087.

     (d)  During  the  past  five  years,  the  Reporting  Person  has not  been
          convicted in a criminal  proceeding  (excluding  traffic violations or
          similar misdemeanors).

     (e)  During the past five years,  the Reporting Person has not been a party
          to a  civil  proceeding  of  a  judicial  or  administrative  body  of
          competent jurisdiction, as a result of which he was or is subject to a
          judgment,  decree or final order  enjoining  future  violations of, or
          prohibiting  or  mandating  activities  subject  to,  federal or state
          securities laws or finding any violation with respect to such laws.

     (f)  The Reporting Person is a citizen of the United States.

Item 3.  Source and Amount of Funds or Other Consideration.

     On  June  18,  1998,  the  Corporation   completed  its  acquisition   (the
"Acquisition")  of 100% of the issued  and  outstanding  common  stock of Marine
Transport  Lines,   Inc.   ("MTL")  from  selling   shareholders  of  MTL  ("MTL
Shareholders")  in exchange for 17,845,541  shares of the  Corporation's  common
stock, par value $.50 per share (the "Common  Stock").  The Reporting Person was
one of the MTL  Shareholders  and sold 637,547  shares of common stock of MTL in
exchange for 5,117,736 shares of the Common Stock. Steamboat Road Holdings, Inc.
("Steamboat"),  a  Delaware  corporation  of which  the  Reporting  Person  is a
stockholder,  director and officer,  sold 7,710 shares of common stock of MTL in
exchange  for 61,892  shares of the Common  Stock and  Larchmont  Partners  L.P.
("Larchmont"), a Delaware limited partnership of which Steamboat was the general
partner,  sold  77,070  shares of common  stock of MTL in  exchange  for 618,660
shares of Common Stock.  On June 18, 1998, the  Corporation  effected a 1 for 10
reverse  stock  split of the  Common  Stock.  On June 29,  1998,  Larchmont  was
dissolved and a Certificate of Cancellation was filed. In connection  therewith,
all of the assets of Larchmont were distributed to its partners,  and Steamboat,
as general partner, received 619 shares of the Common Stock. After giving effect
to the reverse  stock split and the  liquidation  of  Larchmont,  the  Reporting
Person owns 511,773 shares of the Common Stock of the  Corporation  directly and
6,808 indirectly through Steamboat.

Item 4.  Purpose of Transaction.

     The  Reporting  Person  does not have any  present  plan or  proposal  as a
stockholder which relates to, or would result in any action with respect to, the
matters  listed in paragraphs  (b) through (j) of Item 4 of Schedule 13D. In the
future, the Reporting Person may purchase  additional shares of the Common Stock
of the Corporation in the open market or in private transactions.

Item 5.  Interest in Securities of the Issuer.

     (a)  As of June  26, 1998,  the  Corporation  had  issued  and  outstanding
5,611,639 shares of Common Stock.

     The Reporting  Person is the  beneficial  owner of 518,581 shares of Common
Stock or 9.2% of the outstanding Common Stock,  consisting of (i) 511,773 shares
of Common  Stock  owned  directly  and (ii) 6,808  shares of Common  Stock owned
indirectly through Steamboat.

     (b)  The Reporting Person has the sole power to vote, or to direct the vote
of, 511,773  shares of Common Stock,  and shared power to vote, or to direct the
vote of,  6,808  shares of Common  Stock;  and sole power to  dispose  of, or to
direct the  disposition  of,  511,773 shares of Common Stock and shared power to
dispose of, or to direct the disposition of, 6,808 shares of Common Stock.

     (c)  See Item 3.

     (d)  6,808  shares  of the  Common  Stock  of the  Corporation  are held by
Steamboat Road Holdings,  Inc., of which the Reporting  Person is a stockholder.
The other stockholders of Steamboat are Paul B. Gridley and Mark L. Filanowki.

     (e)  Not applicable.

Item 6.   Contracts, Arrangements, Understandings or Relationships with Respect
          to Securities of the Issuer.

     6,808 shares of the Common Stock of the  Corporation  are held by Steamboat
Road Holdings,  Inc., of which the Reporting Person is a stockholder.  The other
stockholders of Steamboat are Paul B. Gridley and Mark L. Filanowki.

Item 7.   Material to Be Filed as Exhibits.

     Exhibit A -  Acquisition  Agreement  dated as of September 15, 1997, by and
among OMI Corp., Universal Bulk Carriers, Inc., Marine Transport Lines, Inc. and
the persons set forth on Exhibit A attached  thereto,  incorporated by reference
to Exhibit 10.13 to the Form 10-Q Report of the Company for the quarterly period
ended September 30, 1997 (File No. 000-11573).







Signature.

     After  reasonable  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.

Date:  June 29, 1998

                                                            Richard T. du Moulin



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