[GH85Carrera]

During World War I, German engineer Otto Steinitz had the idea of testing aircraft engines and propellers on railcars. Carl Geissen designed the engine mount, and testing was carried out on a special track at the German Aviation Research Institute in Berlin. The test car reached speeds of up to 97 mph (140 km/h). After the war, the propeller-driven railcar concept led Steinitz to design a special two-axle car with a mount for an aircraft engine at each end. Known as the Dringos-Wagen, the machine made a 25-mile (40-km) test run from Grunewald to Beelitz on 11 May 1919.