 The Soviet Union enjoyed air superiority throughout the war. The Soviet Air Force, supporting the Red Army's invasion with about 2,500 aircraft (the most common of which was the Tupolev SB) was not as effective as the Soviets might have hoped. The material damage by the bomb raids was slight as Finland did not offer many valuable targets for strategic bombing. Very often, targets were small village depots with little value. The country had only a few modern highways in the interior, therefore making railway systems the main targets for bombers. The rail tracks were cut thousands of times, but they were easy to repair and the Finns usually had trains running again in a matter of hours. The Soviet air force learned from its early mistakes, and by late February they instituted more effective tactics.
