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US Army Corps of Engineers Steam Tank
US Army Corps Of Engineers Steam Tank 1918.jpg
The US Army Corps of Engineers Steam Tank; the sponson is absent
Place of origin  United States
Weight 50.8 t
Length 10.6 m
Width 3.8 m
Height 3.2 m
Crew 8

Armor 13 mm
four .30 cal. machine guns
Engine 2 steam
500 hp (373 kW)
Power/weight 9.8 hp/tonne
Suspension unsprung
Speed 6 km/h

The Steam Tank (Tracked) was an early U.S. tank design of 1918 imitating the design of the British Mark IV tank but powered by steam.

The type was designed by an officer from the U.S. Army's Corps Of Engineers. The project was started by General John A. Johnson with the help of the Endicott and Johnson Shoe Company and financed by the Boston bankers Phelan and Ratchesky (it cost $60,000). Expertise was called in from Stanley Motor Carriage Company in Watertown, Massachusetts, that produced steam cars. The engines and boilers of two Unit Railway Cars were built in. Earlier fighting vehicles projects had employed steam power because petrol engines were not yet powerful enough; the Steam Tank however used it for the main reason that it was meant to be a specialised flame thrower to attack pillboxes and the original design had this weapon driven by steam. When the main device to build up sufficient pressure became a 35 hp (26 kW) auxiliary gasoline engine, the two main 2-cylinder steam engines with a combined power of 500 hp (370 kW) remained, each engine driving one track to give a maximum speed of 4 mph (6 km/h). The transmission allowed two speeds forward and two in reverse. The steam engines used kerosene for fuel.

The flame thrower, located in the front cabin, had a range of 90 feet (27 m); additionally there were four 0.30 inch machine guns; two in a sponson at each side. The length of the vehicle was 34 feet 9 inches, the width 12 feet 6 inches and the height 10 feet 4.5 inches. The tracks were 24 inches wide. Each track frame carried mud clearing spikes, sometimes mistaken for battering rams. The tank had a weight of about fifty short tons. There was to have been a crew of eight, on the assumption there were a commander, a driver, an operator of the flame thrower, a mechanic and four machine gunners.

Only one was completed in Boston and demonstrated in April 1918, in several parades also, on one occasion breaking down in front of the public. The prototype was in June shipped to France to be tested — with much publicity to bolster allied morale — and was named America. The flame thrower nozzle was moved to a rotating turret on the roof of the cabin. There was also another steam-powered AFV project (the Steam Wheel Tank) that didn't use tracks but was three-wheeled, hence the designation "(Tracked)" or "(Track-laying)". The design combined serious cooling problems with a dangerous vulnerability due to its two steam boilers and large fuel reservoirs needed to heat the two main engines, and feed both the auxiliary engine and the flame thrower.

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