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plural railbuses or railbusses
(rail transport) A lightweight passenger railway vehicle, similar in appearance to a bus quotations examples
They were ruled out as over-engineered and too expensive for mass production, and lost out to Class 141 and '142' railbuses, and then Class 150s.
2023 April 5, “£35,000 needed to save a Class 317 and create rebuilt '210' DMU”, in RAIL, number 980, page 8