T-26 Light Tank (Russia)

The T-26 Light Tank was produced in greater numbers than any other pre-war Soviet Tank, and was the most numerous tank in Red Army service in June 1941.
The T-46 Light Tank was developed in an attempt to improve the mobility of the T-26, the most numerous Soviet tank from the mid 1930s until the German invasion of 1941.
The T-25 Light Tank was a second attempt to improve the mobility of the T-26 light tank by installing Christie suspension