Cab Signalling Caboose Calling-on Signal Capacity claim Capstan Cant Cant Rail Car Cardan Shaft Carline Carriage Catenary CBM CEN] CENELEC Centre Siding Centering Device CER Chair Check Rail Chopper Control Clasp Brakes CMC Coach Coasting Coefficient of Friction Collector Shoe Commonwealth Bogie Communication Compressor Conceptual Data Model Condition Based Maintenance Conductor Conductor Rail Consist Controlled vocabulary Converter Corrective maintenance COTS Cripple Crossover Current Rail Cut