Bogie
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A bogie (UK) or wheel truck (US) is a structure underneath a train to which wheel axles (and, hence, wheels) are attached. If they are used there are two for each carriage, wagon and locomotive, or alternatively, they are at the connections between the carriages or wagons. The connections of the bogies with the cars allow a small rotational movement around a vertical axis.
Usually the train floor is at a level above the bogies. However, for a double decker this applies only at the bogies: between them the bottom deck is lower.
There are Low floor trams without bogies.
See also: Diesel multiple unit
In the military, a bogie (or bogey) is an unidentified object, usually aerial. If the bogie turns out to be an enemy aircraft, it is then called a bandit.
Bogie is a nickname for the actor Humphrey Bogart.
Bogies (singular bogy) can mean ghosts.
Bogies (or bogeys) is British slang for a piece of nasal mucus; see snot, or the American equivalent, booger.
de:Drehgestell es:Bogi fa:هزارچرخ fr:Bogie ja:鉄道車両の台車 nl:Draaistel