This book is dedicated to the medium tanks of the USSR, which took part in the Second World War. Here are their tactical and technical characteristics, and also describes the history of creating and upgrading models. This is an extended edition. It added information about the legendary Soviet tank T-34 and its modifications.The medium tanks of the USSR are distinguished by good armament and rational reservation, increasing the chance of rebounding or non-penetration. However, the firepower had to be paid with precision, which makes it necessary to shorten the distance to the middle-near range.