DB Class E 41

Its nickname is Knallfrosch (firecracker), as the tap changer makes loud cracking noises when changing notches.

Originally designed as an effective means of traction for light passenger trains, and with a top speed of 120 kilometres per hour (75 mph)[2] and an axle load below 17 tonnes (16.7 long tons; 18.7 short tons), class E 41 was also designated for passenger services on smaller lines.

In the 1950s, due to general lack of locomotives, class E 41 was also used for express train service.

Less successful was the usage with S-Bahn trains, as class E 41 was not equipped with an electric brake, which would have helped to reduce abrasion.

The last four remaining units, which finally were held ready hot standby around Frankfurt and used in case of need for defective younger machines were de-commissioned in December 2006.