X0305 4 2012-05-04 0 0000277948 CSX CORP CSX 0001237371 MUNOZ OSCAR 500 WATER STREET JACKSONVILLE FL 32202 0 1 0 0 Executive Vice President & CFO Common Stock 2012-05-04 4 F 0 15015 22.15 D 629824 D Common Stock 2012-05-08 4 A 0 23073 21.99 A 652897 D Withholding of stock to satisfy tax withholding obligation. Restricted stock units awarded pursuant to the approved 2010 CSX Stock and Incentive Award Plan. The units vest on May 7, 2015. /s/ Mark D. Austin, Attorney-in-Fact 2012-05-08