railcar

n. rail vehicle powered by its own engine designed to carry and transport passengers; railroad car

A railcar (not to be confused with a railway car) is a self-propelled railway vehicle designed to transport passengers. The term "railcar" is usually used in reference to a train consisting of a single coach (carriage, car), with a driver's cab at one or both ends. Some railways, e.g. the Great Western Railway, used the term Railmotor; others use railbus.
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Noun
1. a wheeled vehicle adapted to the rails of railroad; "three cars had jumped the rails"
(synonym) car, railway car, railroad car
(hypernym) wheeled vehicle
(hyponym) baggage car, luggage van
(member-holonym) train, railroad train
(part-meronym) suspension, suspension system