Holt gas-electric tank

The Holt gas–electric tank was the first prototype tank built in the United States in a collaboration between the Holt Manufacturing Company and the General Electric Company. The transmission was petrol-electric with gasoline engine coupled to generator driving electric motors connected to the tracks. Only a single example was built during 1917–1918, as testing proved it lacked the agility and maneuverability required. The crew number is often given as six, on the assumption there would be two machine gunners, a gunner and loader for the main gun, a driver and a commander.