The WUMAG models with a 65 hp Mercedes diesel engine were among the smallest rail buses in Germany. Most of them had a wheelbase of 4.5 meters, but there were also variants with 3.7 and 6.0 meters. Power was sent to one axle via a Mylius gearbox. With this construction they wanted to compete against the Wismar rail buses, but could not sell large numbers. Nevertheless, the vehicles were taken over by the Reichsbahn after the Second World War and were used for a long time. 