Equipping the V100 006 with the more powerful 1, 350-HP motor on a trial basis was very successful. Without really waiting for the results of further trials, the German Federal Railway (DB) ordered additional machines with the stronger motor unit. It wasn�t noticed until later that the cooling system reached its capacity limits very often, whereupon, starting with V100 2020, the frame and the motor�s front-end section were lengthened for a larger cooler. This is why the V100 2002-2019 differed externally from the other V100.10 only by their higher fleet number.