When it was decided to build a cruiser tank type, the plan was to base it on the American M3 tank. The Ram tank had a cast hull and in some variants carried a 75mm gun. The odd thing is that these tanks never saw combat, but instead were used for training of tank crews in the UK. At a certain point the Allies decided to put all their production force into the production of M4 Sherman tanks. There are hints in several articles about the stupidity of American policy makers who left Allied armoured forces with the inferior M4 Sherman and its 75mm gun to face the superior Panther and Tiger Tanks with main gun up to 88mm. The mismatch resulted in many unnecessary deaths. The slowness and stupidity of tank development in World War II is astonishing when it is examined in comparison to the speed, ingenuity and results of aircraft development of the same period.
Bluetyger - William J. Gibson's Notebook 