The IS-2 is a Soviet heavy tank, the second of the IS tank series named after the Soviet leader Joseph Stalin. It was developed and saw combat during World War II and saw service in other Soviet allied countries after the war.
The KV-85 was a stop-gap solution until the introduction of the IS series. Note the modified KV chassis with the removal of the hull machine-gunner/ radio operator's station with one operated by the driver, and the driver's station slightly centered at the front; a staple design of all IS-series tanks.
IS-85 (IS-1) Prototype equipped with D-5T gun. Later IS-2 converted models were replaced with the 122mm D-25T gun whilst retaining the same hull.
Line drawing of IS-2
Armor plan of IS-2, models 1943 (top) and 1944 (bottom).
Heavy tank is a term used to define a class of tanks produced from World War I to the end of the Cold War. These tanks generally sacrificed mobility and maneuverability for better armour protection and equal or greater firepower than tanks of lighter classes.
A Soviet IS-3 heavy tank
German heavy tank A7V of WWI
The German Tiger I heavy tank
IS-2 heavy tank