n A wheeled vehicle that moves independently, with at least three wheels, powered mechanically, steered by a driver and mostly for personal transportation; a motorcar or automobile.
n (rail transport|chiefly|North America) An unpowered unit in a railroad train.
n (rail transport) an individual vehicle, powered or unpowered, in a multiple unit.
n (rail transport) A passenger-carrying unit in a subway or elevated train, whether powered or not.
n A rough unit of quantity approximating the amount which would fill a railroad car.
n The moving, load-carrying component of an elevator or other cable-drawn transport mechanism.