Comparing: SU-14-1 vs. SU-14-2 vs. Object 261

Developed on the basis of the SU-14. In 1936 a prototype was manufactured and tested. In 1937 the project supervisor was purged and the project was canceled. The prototype was shipped to Kubinka for storage. In 1941, during the Battle of Moscow, the SU-14-1 was used for long-range bombardment.

A "Special Purpose Heavy Triplex" self-propelled gun developed from 1932 through 1937, with two prototypes modernized in 1940. It never entered mass production.

Developed on the basis of the IS-7 by the design bureaus of the Kirov Plants in Chelyabinsk and Leningrad. The project was launched in 1947, but was canceled while still in the design phase.