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
Urbanization in the German Empire did and while only one-fifth of the population in both the Rhineland and Westphalia (in the western part of Germany) did. Overall, the most robust urbanization in Germany during this time period occurred in the Rhineland, Westphalia, Saxony, and Brandenburg. Similarly, industrial development in Germany during this time focused on the Ruhr, Saxony, and Silesia. Out of the total population in these provinces, 47% of Brandenburg's population, 40% of Westphalia's population, and 50% of the Rhineland's population lived in communities of 20,000 people or more in 1910. Between 1875 and 1910, German cities experienced a huge increase in their population.