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Bogie
Chassis for wheels and suspension under vehicles / From Wikipedia, the free encyclopedia
A bogie (/ˈboʊɡi/ BOH-ghee) (or truck in North American English) is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles. Bogies take various forms in various modes of transport. A bogie may remain normally attached (as on many railroad cars and semi-trailers) or be quickly detachable (as the dolly in a road train or in railway bogie exchange). It may include a suspension component within it (as most rail and trucking bogies do), or be solid and in turn be suspended (as most bogies of tracked vehicles are); it may be mounted on a swivel, as traditionally on a railway carriage or locomotive, additionally jointed and sprung (as in the landing gear of an airliner), or held in place by other means (centreless bogies).[citation needed]
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Although bogie is the preferred spelling and first-listed variant in various dictionaries,[1][2][3] bogey and bogy are also used.[1][2]