Comparing: Churchill Gun Carrier vs. AT 8 vs. SU-100Y

The vehicle was developed on the basis of the Churchill tank. The cabin with the 3-inch gun was placed in the front. Initially, 100 vehicles were ordered. Later, the order was reduced to 24 vehicles. Eventually, a total of 50 vehicles were manufactured from 1941 through 1942. However, they never saw action.

The vehicle was conceived as a breakthrough tank. The design project evolved from the AT-7 project, and both projects were submitted at the same time. No prototypes were built because the A39 Tortoise was preferred.

Developed on the basis of the T-100 heavy tank. The vehicle was intended to neutralize enemy pillboxes and destroy enemy vehicles. The only prototype was manufactured in March 1940. The vehicle never entered mass production.