Rhine-Ruhr S-Bahn Rhine-Ruhr S-Bahn The Rhine-Ruhr S-Bahn () is a polycentric and electrically driven S-train network covering the Rhine-Ruhr Metropolitan Region in the German federal state of North Rhine-Westphalia. This includes most of the Ruhr (and cities such as Dortmund, Duisburg and Essen), the Berg cities of Wuppertal and Solingen and parts of the Rhineland (with cities such as Cologne and Düsseldorf). The easternmost city within the S-Bahn Rhine-Ruhr network is Unna, the westernmost city served is Mönchengladbach. The S-Bahn operates in the areas of the Verkehrsverbund Rhein-Ruhr (VRR) and Verkehrsverbund Rhein-Sieg (VRS) tariff associations, touching areas of Aachener Verkehrsverbund at Düren
Rhine-Ruhr is characterized by having the warmest winters in Germany, especially its western part at the Lower Rhine area. Classified by Köppen-Geiger climate classification to be oceanic (Cfb). The area has four international commercial airports, and multiple smaller aerodromes for general aviation. North Rhine-Westphalia has the densest network of Autobahns in Germany. The rail, S-Bahn, U-Bahn and bus companies are administered through a consortium of local and regional transport lines, the "Verkehrsverbund Rhein-Ruhr". It offers a rapid transit system which interconnects all cities and their respective local buses, trams, U- and S-Bahn systems, partly under the umbrella of Deutsche Bahn. Their