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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.
The phrase 10-4 is adapted from police code and has been widely used by CB radio users for many years. It means yes or is an acknowledgment of something that has been said. The CB handle Rubbe... Read More Â». http://www.answerbag.com/q_view/2130634. Top Q&A For: Where did the phrase10-4 rubber duckycome from.