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
Ruhr from over 140 different countries. Almost all their descendants today speak German as a first language, and for various reasons, they do not identify with their Polish roots and traditions, often their Polish family names only remain as a sign of their past. The Industrial Heritage Trail () links tourist attractions related to the European Route of Industrial Heritage in the Ruhr area. Ruhr is known for its numerous cultural institutions, many of which enjoy international reputation. Ruhr has three major opera houses and more than 10 theaters and stages. There are special classical music halls like the Bochumer Symphoniker,