CSX (CSX) 10-Q 2007 Q2 Quarterly report

      

        Exhibit 32.1      

    

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of CSX Corporation on Form 10-Q for the period ending June 29, 2007 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Michael J. Ward, Chief Executive Officer of the registrant, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

1.   The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.   The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the issuer.

Date:  July 24, 2007

/s/  MICHAEL J. WARD                                                                           

Michael J. Ward

Chairman, President and Chief Executive Officer