Developed in 1934 by the tank bureau within the economic division of the Joint State Political Directorate. The project was designed to replace the T-28. The working prototype was produced in Leningrad, at the Experimental Kirov Plant (Plant No. 185) in 1935, under the supervision of engineer N. V. Tseyts. The vehicle was provided with a wheeled and caterpillar propulsion system. The tank entered service in February 1936; its production was started at Leningrad Kirov Plant. Only a few vehicles were built before production was discontinued due to complex construction and unreliable chassis.
This is a Premium vehicle. Premium vehicles earn more credits and experience per battle, and provide a range of other bonuses.
Time for the successive autoreloading of each shell into the magazine.
The improved system allows the time to be decreased for autoreloading the next shell upon firing the loaded shell when the corresponding indicator is displayed
Characteristics are specified for Siege mode.
The technical characteristics are displayed for the charged turbine mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.