The Vehicle
The American response to the German Tiger tank was the M-26 Pershing. It had good armor and its 90mm gun finally gave the Allies a weapon that could handle the Tiger. However, its engine was too weak and the vehicle suffered in mobility, so after the war a start was made on a replacement, designated the M-42 (not to be confused with the M-42 light tank design). But that vehicle would not be available for years, so the engine problem in the M-36 was addressed by fitting a new engine, which resulted in the M-46. It was better, but not really "new". Work continued on the M-42, which would have a similar hull and engine, but a new turret with a better ballistic shape and heavier armor in the front.