Unittrain, if it's a successor road, then just paint over it!
A lot of the old CR 3bays ended up in captive sand service on a TSBY-AA-CR routing from the Yuma sand pits to the Cleavland foundry. There was at least one old CR with PC markings showing through. I might have a picture of it somewhere.
The cars, which dissapeared after the Conrail breakup, where a mix of CR, PC, PRR & EL cylindricals and other assorted hoppers.