Au station is a railway junction in the town of Au (Sieg) in the German state of North Rhine-Westphalia

North Rhine-Westphalia

North Rhine-Westphalia is the most populous state of Germany, with four of the country's ten largest cities. The state was formed in 1946 as a merger of the northern Rhineland and Westphalia, both formerly part of Prussia. Its capital is Düsseldorf. The state is currently run by a coalition of the...

 on the Sieg Railway to Siegen

Siegen station

Siegen station is the main station of the town of Siegen, in the German state of North Rhine-Westphalia. It is in close to the modern centre of Siegen, which includes the bus station and the Sieg Carré and City Galerie shopping centres.-History :...

, where the Engers–Au railway branches off to Altenkirchen

Altenkirchen

Altenkirchen is a town in Rhineland-Palatinate, Germany, capital of the district of Altenkirchen. It is located approx. 40 km east of Bonn and 40 km north of Koblenz. Altenkirchen is the seat of the Verbandsgemeinde Altenkirchen.-References:...

, where it connects with the Upper Westerwald Railway .

The section of the Sieg Railway between Eitorf

Eitorf

Eitorf is a municipality in the Rhein-Sieg district, in North Rhine-Westphalia, Germany. It is situated on the river Sieg, approx. 25 km east of Bonn....

 and Wissen

Wissen

Wissen is a town in the district of Altenkirchen, in Rhineland-Palatinate, Germany. It is situated on the river Sieg, approximately 12 km northeast of Altenkirchen.Wissen is the seat of the Verbandsgemeinde Wissen....

 through Au was opened on 1 August 1860. On 1 May 1887, the branch was opened to Altenkirchen, connecting with the Upper Westerwald Railway to Limburg and additional tracks was added at Au. In 1885 Au consisted of only four houses and 16 inhabitants.

Au is served by the Rhein-Sieg-Express (RE 9) on the Aachen

Aachen Hauptbahnhof

Aachen Central Station is the train station for the city of Aachen, in the far west of Germany near the Dutch and Belgian border. It is the largest of the four currently active Aachen stations, and is integrated into the long-distance network.- History :...

–Cologne

Köln Hauptbahnhof

Köln Hauptbahnhof is the central railway station in Cologne, Germany.The station is an important local, national and international hub, with many ICE, Thalys and Intercity trains calling there, as well as regional RegionalExpress, RegionalBahn and local S-Bahn trains...

–Siegen route, the Rhine-Ruhr S-Bahn line S12 service on the Düren

Düren station

Düren station is located to the north of the centre of Düren and is the largest station in the city and the district of Düren. It is located at the intersection of the Cologne–Aachen high-speed line with the lines to Linnich, Heimbach and Euskirchen. Until 1992 it was also connected to the Erft...

–Cologne–Au route and two Regionalbahn

RegionalBahn

The Regionalbahn is a type of local passenger train in Germany.-Service:Regionalbahn trains usually call at all stations on a given line, with the exception of RB trains within S-Bahn networks, these may only call at selected stations...

 services, the Oberwesterwald-Bahn (RB 28), to and from Limburg an der Lahn

Limburg (Lahn) station

Limburg station is a station of the city of Limburg an der Lahn in the German state of Hesse. It is on the Lahn Valley Railway , running between Koblenz and Gießen. The only section of this that is electrified in the Limburg area is between Limburg freight yard and Eschhofen station...

 and the Sieg-Dill-Bahn (RB 95) to and from Dillenburg

Dillenburg station

Dillenburg station is a through station in the town of Dillenburg in the German state of Hesse. Immediately adjacent to the station is the central bus station, which is served by many bus lines connecting to the surrounding countryside...

.