Conrail rostered a large fleet of coalporter cars. Hollidaysburg Car shops rebuilt old triple hoppers into the G52H, G52L and G52R class starting in 1991. In 1995, Conrail began assembling and painting the G52X Cromweld class out of kits supplied by Johnstown-America. Conrail also acquired several hundred cars from SFIX (System Fuels, Inc.) which were assigned to the G52W class.

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