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Line S 13 is a S-Bahn

S-Bahn

S-Bahn refers to an often combined city center and suburban railway system metro in Austria, Germany, Switzerland and Denmark...

 line of the Rhine-Ruhr network. It is operated by DB Regio

DB Regio

DB Regio AG is a subsidiary of Deutsche Bahn which operates short and medium distance passenger train services in Germany, and operates light and heavy rail infrastructure in the United Kingdom.-Germany:...

. The S13 runs from Horrem

Horrem station

Horrem station is a railway junction in the town of Horrem in the German state of North Rhine-Westphalia. It connects the Cologne–Aachen high-speed railway and the Erft Railway, running between Horrem and Düsseldorf. It is served by S-Bahn line S 12 on the Düren–Horrem–Cologne–Troisdorf–Au route...

, at peak times, via 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...

 to Troisdorf

Troisdorf station

Troisdorf station is a railway junction in the town of Troisdorf in the German state of North Rhine-Westphalia, where the line from Cologne separates into the East Rhine Railway to Neuwied and the Sieg Railway to Siegen. In addition to various regional rail services Troisdorf is served by the S 12...

. Normal operation begins at Köln Hansaring

Köln Hansaring station

Köln-Hansaring is a subway and railway station situated on the Cologne Ring road in Innenstadt, Cologne in western Germany. It is served by the S6, S11, S12 and S13 lines of the Rhine-Ruhr S-Bahn, the Regional rail line RB25, and the 12 and 15 lines of Cologne Stadtbahn.The subway station opened in...

. It runs with Line S 12 for most of its route, splitting from it only to run through Cologne/Bonn Airport. Services operate every 20 minutes on working days and every 30 minutes on Saturdays, Sundays and public holidays, using class 423

DBAG Class 423

The Class 423 EMU is a light-weight articulated electric railcar for S-Bahn commuter networks in Germany. The train has similar dimensions to its predecessor, the Class 420 EMU, but is significantly lighter and has one large passenger compartment, while that of the 420 is divided into three parts...

 electric multiple units.

The route runs on the Cologne–Aachen line (opened by the Rhenish Railway Company

Rhenish Railway Company

The Rhenish Railway Company was along with the Cologne-Minden Railway Company and the Bergisch-Märkische Railway Company one of the railway companies that in the mid-19th century built the first railways in the Ruhr and large parts of today's North Rhine-Westphalia.-Foundation :The...

 between Cologne and Düren in three stages between 1839 and 1841), the East Rhine Railway (opened to Troisdorf by the Rhenish Railway in 1870, with an extension to Cologne opened in 1874) and the Cologne Airport loop (opened in 2004) The western section of the S 13 service from Düren to Köln Messe/Deutz was opened on 15 December 2002. It was extended to Troisdorf in 13 June 2004, dropping Köln Messe/Deutz. It is proposed to extend the line to Bonn-Oberkassel

Bonn-Oberkassel station

Bonn-Oberkassel station is a on the East Rhine Railway in the suburb of Oberkassel in the Bonn district of Beuel in the German state of North Rhine-Westphalia.-History :...

, with construction possibly starting in 2012 and services starting at the end on 2016.