Comparing: FCM 50 t vs. Kirovets-1

Development was started in December 1945. The vehicle was conceived as an alternative for the AMX 50t and combined archaic features typical of the pre-war French tank-construction industry as well as German innovations. The vehicle was to be equipped with an additional container trailer, equipment for underwater driving, and a demountable mine clearer.

The Kirovets-1 project (IS-3, prototype No. 1) was developed from July through November 1944. The prototype was built at the Chelyabinsk Kirov Plant in September–October 1944. From December 18 through December 24, 1944, the vehicle underwent trials at the NIBT proving grounds in Kubinka. After it was decided to manufacture a pilot series of the modified IS-2 with a hull proposed by engineers of Plant No. 100 and Сentral Research Institute-48, the work on the Kirovets-1 was discontinued.