History
The predecessor of the S-Bahn was the so-called Bezirksschnellverkehr between the cities of Düsseldorf and Essen, which consisted of steam-powered push-pull trains, mainly hauled by Class 78 and Class 65 engines.
The first S-Bahn lines were operated using Silberling cars and Class 141 locomotives, however these were not suited for operations on an urban network and were soon replaced by Class 420 electric multiple units. In the mid-1970s, the Class 420 was decided to be unsuitable for the network as well, mainly due to being uncomfortable and lacking a lavatory, since one could travel rather long distances on the Rhine-Ruhr network, which wasn't the case on the Munich S-Bahn for which the class 420 were originally designed. At first an improved version of the 420, the Class 422, was discussed, but in 1978 the Deutsche Bundesbahn commissioned a batch of coaches from Duewag and MBB, called the x-Wagen (the x-car) after its classification code Bx. In late 1978, the first prototypes (the 2nd class cars of type Bx 794.0 and the cab car Bxf 796.0) were handed over to the DB, the 1st/2nd class cars ABx 791.0 following in early 1979. The prototypes were successful, and so from 1981 to 1994 several series were commissioned, first to be hauled by the Class 111 engines, but after the German reunification the surplus Reichsbahn engines of Class 143 replaced the 111s on the S-Bahn network.
Read more about this topic: Rhine-Ruhr S-Bahn
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