Holt gas electric tank

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Holt Gas-Electric Tank
Place of origin	United States
Specifications
Mass	25.4 t (25.0 long tons; 28.0 short tons)
Length	5.03 m (16 ft 6 in)
Width	2.76 m (9 ft 1 in)
Height	2.37 m (7 ft 9 in)
Crew	6
Armor	6–15 mm
Main armament	75 mm Vickers mountain howitzer
Secondary armament	two 7.62 mm (0.300 in) M1917 Browning machine guns
Engine	4-cylinder Holt gasoline 90 hp (67 kW)
Power/weight	3.5 hp/tonne
Transmission	G.E.C. generator powering one electric motor per track
Suspension	vertical coil springs
Operational range	50 km (31 mi)
Maximum speed	10 km/h (6.2 mph)

The Holt Gas-Electric Tank was the first prototype tank built in the United States^[1] in a collaboration between the Holt Manufacturing Company (now Caterpillar Inc.) and the General Electric Company. The tank, built during 1917-1918, was the only one of its kind built, as testing proved it lacked the agility and maneuverability required.^[2] 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.