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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.
Service B, also know as Flex B, or Schedule B, is a service interval in the Mercedes Flexible Service System. You'll need to perform Service B when you service indicator system alerts you that it is necessary, typically at 20,000 miles and every 20,000 mile interval after that.