In order to improve the running characteristics of the E 77, the E 75 was developed with a one-piece frame. The powered axles were further divided into two groups, but here they were mounted within the frame. Contrary to expectations, the running smoothness hardly improved, so that the speed could only be increased from 65 to 70 km/h. Of the 79 E 75s ordered, only 31 were ultimately delivered. They were used in front of passenger and freight trains and after the Second World War were mostly used by the Bundesbahn. Three were modernized in the early 1960s and the last commercial operations took place in 1972. 