T-34 was made on a basis of a battle tank A-32 and accepted for service in 1939. The construction of this vehicle was a quantum jump in the Russian and world tank-building. For the first time it successfully combined antiprojectile armor, powerful weapons and reliable undercarriage.
High mobility was provided by the powerful diesel engine and wide track. High fabricability of the construction allowed to arrange its serial production at the lack of manpower qualified enough at seven factories. During WWII they were trying to develop the construction of the tank and simplify the technology of its production. In the years of war 52 thousand T-34 tanks were made to participate in the battles.