During the second half of 1950s in the Soviet Union a large scale change from steam locomotive traction to the Diesel operation and the electric propolsion took place. However, the reconstruction could not give a full economic effect while the old shunting service of steam engines was kept, because all the depots still had equipment and facilities for steam locomotives' service and repairs running. Respectively, the railroads and big Soviet industrial plants required a lot of diesel-locomotive shunters to be supplied including the electrotransmission ones.