Wikipedia
Rhein-Emscher-Express
The Rhein-Emscher-Express (RE 3) is a Regional-Express service in the German state of North Rhine-Westphalia (NRW), running from Düsseldorf via Duisburg, Gelsenkirchen and Dortmund to Hamm. It connects with the rest of the regional rail network of NRW in Düsseldorf, Duisburg, Oberhausen, Wanne-Eickel, Dortmund and Hamm. In addition, it connects in Düsseldorf, Duisburg, Oberhausen, Dortmund and Hamm with long-distance services.