The design was changed, new turrets devised, which led to the mass-produced M2A2. However, it quickly appeared that the Army wanted a twin-turret configuration, then favored by other armies. The M2A1 was the series production vehicle, only built to ten units in 1936, and equipped with a single turret. The original crew comprised three men, the commander also being the gunner and loader, operating the cal.50 (12.7 mm). However, the internal arrangement made it possible to increase the amount of fuel carried. The engine also was the same, a compact but tall aviation radial Continental W-670, which gave a top speed of 58 km/h (36 mph). The hull general design, turret, tracks, VVSS suspension design with a front drive sprocket and rear idler, at well as the two bogies with vertical coil springs and two return roller in between, were identical to the M1 suspension, in order to save time and be cost-effective. The first M2 had a one-man turret equipped with a cal.50 (12.7 mm) and a coaxial 7.62 mm (0.3 in) Browning M1919, with another placed in the hull, on a ball mount operated by the co-driver. By 1935, this prototype formed the basis for the M2 light tank. After the T1 came the T2 prototype, and the the T2E1 with new VVSS suspensions and a revised, taller hull. The T1 appeared in 1934, and bore some resemblances with the British Vickers 6-ton -Mark E, notably the suspension, made of two quadruple bogies. The first modern infantry tank design (the cavalry already had its M1 "Combat Car"), was the T1, built by Rock Island Arsenal, the main US federal heavy arsenal, in charge of the specifications. M2 Light Tank Light tank (1935-40) USA - about 696 built The T2E1 prototype
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