Exhibit 32.2

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 March 28, 2008 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Oscar Munoz, Chief Financial 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: April 15, 2008

/s/ OSCAR MUNOZ                                                        

Oscar Munoz

Executive Vice President and Chief Financial Officer