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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.
Train Facts. 1  Ringling Bros. is divided into two simultaneously traveling unit trains: the Red Unit and the Blue Unit. 2  Each circus train has a designated trainmaster who is responsible for the safe operation and timely movement of the unit train. Each railroad train crew is provided with a circus radio for operational and emergency communications. In addition, the circus trainmaster monitors the carrier railroadÃs radio frequency to be aware of other traffic on the railroad.