The T-34-85 is a Soviet tank designed by the Kharkiv Morozov Machine Building Design Bureau in 1943, and was a vast improvement of the original T-34-76 designed in 1940, featuring a more powerful 85 mm gun, additional armour and a fifth crew member. It was produced between 1940–1958 and saw much action with Soviet Forces during World War II and was the most effective tanks of World War II. Even after its replacement by the T-54, the T-34 remained in service with many other Warsaw Pact nations and is still in service with over a dozen countries even today.