The Osterath–Dortmund-Süd railway is a historically significant line in the German state of North Rhine-Westphalia. Parts of it are closed, much of it is now used for freight only, but several sections are still used for Regional-Express, Regionalbahn or Rhine-Ruhr S-Bahn services. The nearly 76 kilometre long line was built in three stages between 1866 and 1874 by the Rhenish Railway Company (, RhE), creating a third major east-west line through the Ruhr area. It was intended to compete effectively with the established and profitable lines of its competitors—the Duisburg–Dortmund line of the Cologne-Minden Railway Company and the Ruhr line of Bergisch-Märkische Railway Company, but it was not successful. History The Rhenish Railway concentrated for a long time left on the territories next to the Rhine, leaving the Ruhr area with its coal mines and emerging industries to be opened up by the Cologne-Minden and the Bergisch-Märkische railway companies. The RhE wanted to penetrate this lucrative market and began building the Rurh line from its Osterath station on its Lower Left Rhine line. Between the port of Mülheim and Essen's Graf Beust colliery, the line used the route of a horse-hauled railway operated by the colliery from 1853 to 1865. Current situation Little passenger traffic developed on the line due to the parallel railway of the Bergisch-Märkische Railway Company. Passenger services were abandoned on the section between Mülheim-Heißen and Essen-Kray-Nord in 1959, between Essen-Kray Nord and Bochum Präsident in 1965 and between Bochum Präsident and Bochum-Langendreer in 1979. Until 30 May 1986, accumulator railcars of class 515 ran between Duisburg-Rheinhausen and Hohenbudberg Siedlung. Then the Rhenish line from Krefeld-Linn to the former Hohenbudberg marshalling yard was completely dismantled along with the yard. Instead, the line now uses the parallel route of the Ruhrort-Crefeld District Gladbach Railway Company (Ruhrort–Crefeld−Kreis Gladbach Eisenbahngesellschaft). Four services operate each hour on the RhE line between Duisburg and Rheinhausen: the line from Mönchengladbach is served by the Niers-Haard-Express (RE 42), the Rhein-Niers-Bahn (RB 33) and the Emscher-Niederrhein-Bahn (RB 35) services and the Der Niederrheiner (RB 31) service connects with the Lower Rhine Railway. After crossing over the Rhine on the Duisburg-Hochfeld Railway Bridge, which was destroyed in the Second World War and then rebuilt, all passenger trains leave the main line and continue on the branch line built in 1870 to Duisburg Hauptbahnhof. The section of the Rhenish line from Duisburg-Hochfeld Süd to Mülheim (Ruhr) Hauptbahnhof