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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.
Weights vary across the country but they are usually around 110,000 lbs. The second usual combination that is used across Canada is the B-Train. It is a tandem drive tractor pulling a trailer with three axles, and attached to this trailer is a second trailer with two axles. Across Canada, the B-Train weight limit is 139,700 lbs (63,500 kgs).