ET 30 referred to 24 electric multiple units that were built in 1956 for local express trains in the Ruhr area. They were based on the ET 56, but had a significantly higher output and more modern traction electrics. There was no electric brake. At each end there was a power car with a driver's cab and between them usually one, sometimes two trailer cars with the designation EM 30.
Due to the lack of electrification, they were first used in the Munich and Nuremberg area and were later transferred to the Ruhr area. From 1968, the power cars were designated as class 430 and the trailer cars as the class 830. They were taken out of service between 1980 and 1985. 