The railmotors of J. Weitzer Engine- & Waggon-Building & Iron Casting Joint-stock Company (Hu.: Weitzer János Gép,- Waggongyár és Vasöntöde Részvénytársaság) were Europe's first self-propelled railcars with internal combustion engine built in considerable numbers. The principle of their petrol–electric transmission and the four-cylinder petrol engines came from De Dion-Bouton in France. The electric engines were produced Siemens-Schuckert in Germany.
The first cars were constructed in 1903, the series since 1906. Reports of their use can be added to a total of 65 sold railmotors and 40 trailers. Most of these railmotors were built for 1,435 mm (4 ft 8+1⁄2 in) standard gauge, 11 for metre gauge and 11 for 760 mm (2 ft 5+15⁄16 in) Bosnian gauge. The last ones ran on petrol-electric traction till 1960.