Mariembourg (Belgium) steam festival sept 24, 2006: In Treignes railroad museum: Gasoline-engine driven "Train pusher" for switching single cars. The rubber wheel is on one rail. Probably a war-time invention to cut down on switching engines.
picture by Peter Bottenberg (pjotr_ivanich2000@yahoo.com), Olympus Camedia (not quite as old as the steam engine,but still in working order)