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
International Authority for the Ruhr International Authority for the Ruhr The International Authority for the Ruhr (IAR) was an international body established in 1949 by the Allied powers to control the coal and steel industry of the Ruhr Area in West Germany. Its seat had been in Düsseldorf. It was agreed at meetings in London on 20 April and 2 June 1949 by the United States of America, the United Kingdom, France and the Benelux countries. The London agreement was signed on 28 April of that year. It was abolished by the Treaty of Paris in 1951, which moved its activities to the European Coal