Comparing: T28 Prototype vs. AT 15

Early prototype of a heavy tank designed for breaking through fortifications of the German Siegfried Line. Existed only in blueprints, prepared under the program for developing heavy vehicles that was initiated in September 1943.

Assault tank conceived to break through fortified positions. The design project was ready by the fall of 1943, but no prototypes were manufactured. However, the project became the basis for the A39 Tortoise heavy assault tank.