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Description
Armament: 1 x 37mm gun, 5 x 7.62mm guns
Armor: Max - 12.7mm, min - 5.6mm
Crew: 4
Engine: 435 hp
Speed: (on testing grounds only) 35 mph/56 km/h (with tracks), 58.13 mph/93 km/h (on wheels)
Def:
The T3E2 medium tank was an improved design to the American Walter Christie's T3 medium tank designed by the American company "American LaFrance" whom where known for building fire engines, and up to that point had never built an armored vehicle. Because fo their lack of experience with building tanks, they worked closely with Army organizations especially the Watertown Arsenal. Development of the tank dragged on for some time, and a prototype was not finished until late 1933. American LaFrance getting the contract (and the $200,000 to develop the tank) displeased Christie as he was backing a different company the "US Wheel Track Layer Corporation".
American LaFrance improved upon Christie-s T3 by enlarging it (two men could now fit in the hull, and turret), giving it a more powerful engine (which gave it good speeds on the testing grounds, but in reality.. not so much), enlarging the turret, and mounting 3 more machine guns into it (for unknown reasons) as well as changing the idler wheel to look more like a smaller road wheel, and changing the sprocket wheel to the more conventional "star" shaped. Other changes included: improved access to the tank's engine, and transmission (not by much though), and the discarding the idea of Galls chain and returned to the same gear box as the M.1931.
All five of the prototypes ended up in the American 67th Infantry Regiment where the tank went under a further 60 changes. This new modified version was called the T3E3 medium tank, how ever the tank never scored mass production (even after it was standardized as the "Convertible Medium Tank M1"), and the US Army turned down all further works with American LaFrance.
The prototypes where latter scrapped in the 1950s.

Description
Armament: 1 x 37mm gun, 5 x 7.62mm guns
Armor: Max - 12.7mm, min - 5.6mm
Crew: 4
Engine: 435 hp
Speed: (on testing grounds only) 35 mph/56 km/h (with tracks), 58.13 mph/93 km/h (on wheels)
Def:
The T3E2 medium tank was an improved design to the American Walter Christie's T3 medium tank designed by the American company "American LaFrance" whom where known for building fire engines, and up to that point had never built an armored vehicle. Because fo their lack of experience with building tanks, they worked closely with Army organizations especially the Watertown Arsenal. Development of the tank dragged on for some time, and a prototype was not finished until late 1933. American LaFrance getting the contract (and the $200,000 to develop the tank) displeased Christie as he was backing a different company the "US Wheel Track Layer Corporation".
American LaFrance improved upon Christie-s T3 by enlarging it (two men could now fit in the hull, and turret), giving it a more powerful engine (which gave it good speeds on the testing grounds, but in reality.. not so much), enlarging the turret, and mounting 3 more machine guns into it (for unknown reasons) as well as changing the idler wheel to look more like a smaller road wheel, and changing the sprocket wheel to the more conventional "star" shaped. Other changes included: improved access to the tank's engine, and transmission (not by much though), and the discarding the idea of Galls chain and returned to the same gear box as the M.1931.
All five of the prototypes ended up in the American 67th Infantry Regiment where the tank went under a further 60 changes. This new modified version was called the T3E3 medium tank, how ever the tank never scored mass production (even after it was standardized as the "Convertible Medium Tank M1"), and the US Army turned down all further works with American LaFrance.
The prototypes where latter scrapped in the 1950s.