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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 railway zig zag, also called a switchback, is a way of climbing hills in difficult country with a minimal need for tunnels and heavy earthworks. For a short distance (corresponding to the middle leg of the letter Z), the direction of travel is reversed, before the original direction is resumed. The Lithgow Zig Zag stub was extended at great cost in 1908, only to be completely deviated in 1910. 2  Reversing a train without running an engine around to the rear of the train is hazardous. 3  Top and tail or push pull operation with engines at the rear of the train helps.