For Bobsled we have terms and definitions in 2 topics. The topics are Bobsledding and Roller Coaster.

A large sled made up of two sections linked together. The frame is made of metal, the shell of fiberglass or similar material. There are two sizes, two-man and four-man.
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A unique type of coaster without track - the ride instead consists of a U-shaped gully in which the train is free to travel of it's own accord. Such coasters require very careful design to ensure the train doesn't fly out of it's gully when turning.
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