In rail transport, the expression power car may refer to either of two distinct types of rail vehicle: \n* a vehicle that propels, and commonly also controls, a passenger train or tram, often as the lead vehicle; \n* a vehicle equipped with machinery for supplying heat or electrical power to other parts of a train. The first of these types of vehicle is closely related to the locomotive. What differentiates the locomotive and the first type of power car is their construction or use. A locomotive can be physically separated from its train and does nothing but provide propulsion and control (and heat or electricity for passenger trains). On the other hand, a power car of the first type is frequently an integral part of its train, and some of its interior space may be used for carrying passengers or cargo.

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