Comparing: FCM 50 t vs. IS-6 vs. WZ-111

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.

Plans for this vehicle were drawn up in the construction bureau of the Chelyabinsk Kirov plant from December 1943 to the summer of 1944. Further development and the construction of the first prototype took place at the Uralmash plant. However, the vehicle had no advantages over the other heavy tank designs under consideration, and its armor was seen as inferior to the IS-4 (Object 701), so the IS-6 was not selected for production.

Development of the heavy tank prototype on the basis of the Soviet IS-2 and IS-3 began in the early 1960s under the influence of the T-10. The vehicle was supposed to modernize the armored forces of the PLA. The trials revealed multiple faults, and the development of the vehicle was discontinued in 1964.