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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.
This domino may normally be played either. 1  on the player's own train, or. 2  on another player's train, if that train is marked with a penny, to show that its owner was unable to play on it at their last move, or.  on an extra train, known as the Mexican Train or Caboose, which is always open to all players.