In the United States doodlebug was the common name for a self-propelled railcar. While such a coach typically had a gasoline-powered engine that turned a generator which provided electricity to traction motors which turned the axles and wheels on the trucks versions with mechanical transmissions also existed.Doodlebugs sometimes pulled an unpowered trailer car but were more often used singly.
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Mack Trucks, Pullman Company, J. G. Brill Company, Electro-Motive Diesel, McKeen Motor Car Company, Rio Grande Southern Railroad
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