Comparing: T1 Heavy Tank vs. Churchill I

Development of the T1E2 started in the U.S.A. in May 1940. The vehicle was designed as a heavy tank. The distinctive features of the vehicle were a cast hull and hydromechanical transmission with a double-disc hydraulic converter. Later, the tank was designated M6. A total of 9 vehicles (1 of which was experimental) were produced. The tank never saw action.

The A22 prototype was built by Vauxhall Motors in the fall of 1940. The vehicle first entered mass production in the summer of 1941. Early modifications had no track fenders, a different fan, and a 3-inch howitzer in the hull. A total of 300 Churchill I tanks were manufactured.