The T-26 was replaced in the late 1930s by the T-50. Its armour thickness was the same all around the vehicle, with a fairly effective result for a ligth tank. It was the first light tank made with turret made of a cast steel and fitted with a heavy mantlet. Parts of its chassis and the turret design was very alike the coming T-34. In was prooved to be very good in combat, but the manufacuring was complicated and expensive and the production of 63 (48 armed) units ended in early 1942.