According to Steven Zaloga the pre-war Soviet Army "possessed more armoured vehicles, and more tank units than the rest of the world combined" (my italics) Any articles relating to the various pre-war Tank Types used by the Soviet Armed Forces would be welcome here. Here is a link to an introductory article about Soviet Armor: intro to russian tanks One thing, this has been placed in the pre-war area. As such if we can keep it to pre-war tank designs that would be great!!
One the most famous and striking designs of the pre-war Soviet Tank Force was the "land Battleship", the multi-turreted T-35: Soviet-Empire.com - The Soviet T-35 Tank
And another article on the pre-war development of the Tank Force with a slant on changes made in 1939 and 1940. A Short History of Mechanized Units in the Red Army This is from AMVAS's site on the Soviet Army