CSXT: inherited SD50s from the B&O, C&O, Conrail (split with NS), and Seaboard System; 25 ex-CR units assigned to MofW service, with 8 remaining in regular service; all units except for 8507, 8514, 8520, 8522, 8525, 8526, 8532, 8540, 8550-8552, 8566, 8568, 8586, 8596, 8624, 8629, 8635, and 8641 have been de-rated to 3000 horsepower and re-designated as SD50-2s; the remaining ones will be "dash-twoed" in the future.