railbus

noun

1. A lightweight passenger railway vehicle, similar in appearance to a bus.

   “Constructional features of the railbus include the use of rubber suspension for axlebox/underframe and underframe/body mountings, the use of B.U.T. power transmission equipment, many components of which are interchangeable with those on British Railways standard railcars, power-operated sliding doors, and an absence of normal sidebuffers or drawgear.”

   “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.”