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
Rhine-Ruhr is the University of Cologne "(Universität zu Köln)", founded in 1388 AD. Other universities include: The following register lists all municipalities that officially belong to Rhine-Ruhr area. Demographically, these municipalities include 20 cities (German: ), each with more than 100,000 inhabitants, and 11 districts (German: ), each with a population of more than 250,000 inhabitants. Some districts only belong partly to Rhine-Ruhr area. In such a case only the municipalities that belong to the metro area are listed. Rhine-Ruhr The Rhine-Ruhr metropolitan region () is the largest metropolitan region in Germany with over 10 million inhabitants. It is of polycentric