Exhibit 99.1

[Letterhead of Dr. William C. Richardson]

September 15, 2008

Board of Directors

CSX Corporation

500 Water Street

Jacksonville, Florida 32202

I hereby tender my resignation as a director of CSX Corporation (the “Company”) effective at such time as my successor advises either Michael Ward or Ned Kelly that, as required by Section 13.1-675E of the Virginia Stock Corporation Act, he consents to be elected to the board of directors of the Company.

/s/  William C. Richardson

       William C. Richardson

September 15, 2008