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The BA-I, or sometimes BAI (BroneAvtomobil Izhorskij plant), was the first three-axle armored car of the Red Army. Before that, the BA-27 (1928) was the most common medium armored car in service (215 produced), and forged a pattern for future developments. It was based upon the American truck Ford-Timken. This proved a popular, but rather conservative design with two axles, a bolted hull and the T-18 light tank turret. The Army asked for a bigger model, potentially equipped with heavier turrets and, by 1932, the Izhora factory proposed the BA-I, a six-wheeled vehicle almost entirely assembled by welding.