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1 `B' TRAIN: A TRACTOR pulling two SEMI TRAILERS. The lead unit having a FIFTH WHEEL at the back to attach the second SEMI TRAILER or PUP. (For photo: See `RIG'.)  BACKHOE: A, farm tractor with an EXCAVATOR on the back, and, usually, a bucket, front end loader, on the front.
A typical game of Mexican Train with the branching doubles variation. Mexican Train, also known as Trains, is a game played with dominoes. The object of the game is for a player to play all the dominoes from his or her hand onto one or more chains, or trains, emanating from a central hub or station. The game's most popular name comes from a special optional train that belongs to all players.