EXHIBIT 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 33-29136) pertaining to the CSX Corporation Capital Builder Plan of our report dated May 20, 2005, with respect to the financial statements and supplemental schedule of the CSX Corporation Capital Builder Plan included in this Annual Report (Form 11-K) for the year ended December 31, 2004.

/s/ Ernst & Young LLP  

Independent Certified Public Accountants 

Jacksonville, Florida
June 15, 2005