Emil, also known as the Kranvagn, KRV or Emil Olsson was a heavy tank developed secretly in Sweden during the early 1950s; Kranvagn, meaning mobile crane was a cover-name. The intention was to replace the Swedish Army's disparate tank fleet with a tank that could counter the Soviet IS series heavy tanks and be upgraded continuously. The initial design, in 1950, proposed mounting a 10.5 cm autoloader in an oscillating turret. Due to its size, weight and power to weight it was considered by many to be more of a medium tank than a heavy tank.