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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.
B2 (an event that results in) great harm, damage, or death, or serious difficulty: An inquiry was ordered into the recent rail disaster (= a serious train accident). It would be a disaster for me if I lost my job. This is one of the worst natural disasters ever to befall the area.