EXHIBIT 5




                                [CSX LETTERHEAD]



                                  March 7, 2000



CSX Corporation
One James Center
901 E. Cary Street
Richmond, Virginia  23219

Ladies and Gentlemen:

               I am General Counsel-Corporate of CSX Corporation (the "Company")
and am providing this opinion in connection  with the filing with the Securities
and  Exchange   Commission  of  a  registration   statement  on  Form  S-8  (the
"Registration Statement") relating to the Greenbrier Savings and Investment Plan
and Trust (the  "Plan").  The  Registration  Statement  covers  50,000 shares of
Common Stock of the Company (the "Common  Stock")  which have been  reserved for
issuance under the Plan and Rights to purchase  Preferred Stock  associated with
the Common Stock (the "Rights").

               In  connection  with the  foregoing,  I have made such  legal and
factual  examinations  and inquiries as I have deemed necessary or advisable for
the purpose of rendering this opinion.

               Based upon the foregoing, I am of the opinion that:

1.                    The 50,000 shares of Common Stock,  when issued or sold in
                      accordance with the terms and provisions of the Plan, will
                      be  duly  authorized,   validly  issued,  fully  paid  and
                      non-assessable.

2.                    All  corporate  action  required  under  the  laws  of the
                      Commonwealth  of  Virginia  has been taken for the Rights,
                      when issued in accordance with the terms and provisions of
                      the Rights  Agreement,  dated as of May 29, 1998,  between
                      the  Company  and Harris  Trust  Company  of New York,  as
                      rights agent, to be validly issued.

               I hereby  consent to the  filing of this  opinion as Exhibit 5 to
the Registration  Statement.  I do not admit by giving this consent that I am in
the category of persons whose consent is required under Section 7 of the Act.

                                Very truly yours,


                                /s/ ELLEN M. FITZSIMMONS
                                -------------------------
                                Ellen M. Fitzsimmons
                                General Counsel-Corporate