S1 (Rhine-Ruhr S-Bahn) Services ran via Düsseldorf Airport Terminal station from 24 May 1998 to 28 May 2000. Services were extended from Düsseldorf to Solingen on 13 December 2009, replacing part of the former line S 7 service. S1 (Rhine-Ruhr S-Bahn) Line S1 is a S-Bahn line on the Rhine-Ruhr network. It is operated by DB Regio. It runs from Dortmund west over Essen to Duisburg. From there it travels south to Düsseldorf and Hilden before continuing to Solingen. It is operated at 20 minute intervals, using coupled sets of class 422 four-car electrical multiple units. Line S 1 runs over lines built
S7 (Rhine-Ruhr S-Bahn) and on weekends, every 30 minutes. Line S 7 runs over lines built by two railway companies: There was an earlier line S 7 operated by DB Regio, which began at Düsseldorf Airport Terminal station. From there it ran south to Solingen Hbf via Düsseldorf Hbf. With the change to the 2010 timetable on 13 December 2009, line S1 replaced the service between Düsseldorf Hbf and Solingen. The S11 was extended to run to Düsseldorf Airport Terminal station. S7 (Rhine-Ruhr S-Bahn) Line S 7 is an S-Bahn line on the Rhine-Ruhr network in the German state of North Rhine-Westphalia, which