S19 (Rhine-Ruhr S-Bahn)

Route of S19
Legend
night service to Aachen Aachen Aachen-Rothe Erde Eilendorf Stolberg (Rheinland) Eschweiler Langerwehe 0.0 Düren 4.2 Merzenich 8.9 Buir 17.8 Sindorf 20.5 Horrem S12 25.4 Frechen-Königsdorf S12 28.1 Köln-Weiden West S12 29.5 Köln-Lövenich S12 33.3 Köln-Müngersdorf Technologiepark S12 35.5 Köln-Ehrenfeld S12 38.4 Köln Hansaring S6S11S12 39.2 Köln Hbf S6S11S12 40.3 Köln Messe/Deutz S6S11S12 41.4 Köln Trimbornstr. S12 46.9 Köln-Frankfurter Straße 54.4 Köln/Bonn Flughafen S13 57.7 Porz-Wahn S12 62.2 Spich S12 65.0 Troisdorf S12 69.6 Siegburg/Bonn 76.1 Hennef (Sieg) S12 78.0 Hennef im Siegbogen S12 80.6 Blankenberg (Sieg) S12 83.7 Merten (Sieg) S12 88.3 Eitorf S12 95.1 Herchen S12 100.3 Dattenfeld S12 103.6 Schladern (Sieg) S12 105.4 Rosbach (Sieg) S12 110.1 Au (Sieg)S12
Source: German railway atlas[1]

Line S19 is a S-Bahn line of the S-Bahn Köln network in Germany. It is the youngest line in that network. It is operated by DB Regio with class 423 electric multiple units.

The S19 runs until the early evening from Düren via Cologne to Blankenberg (Sieg), Herchen or Au (Sieg) on working days and between Düren and Hennef (Sieg) on Saturdays, Sundays and public holidays. Services to/from Herchen or Au do not stop in Blankenberg. It shares most of this route with line S12, but it runs through Cologne/Bonn Airport instead of through Porz. The S12 also no longer runs west of Horrem. It is operated every 20 minutes between Düren and Hennef (Sieg), with one course every hour extending to Au (Sieg). Since December 2019 it runs 24/7 between Düren and Hennef.

Two trips of the S19 are extended every night to/from Aachen in order to provide connections between Aachen and the Cologne Bonn Airport.^[2]

The route runs on the Cologne–Aachen line (opened by the Rhenish Railway Company between Cologne and Horrem 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), the Cologne Airport loop (opened in 2004) and the Sieg Railway (opened by the Cologne-Minden Railway Company between 1859 and 1862).

When the line was established in December 2014, it was mostly extending existing courses of the line S13 and giving them an own name for clarity reasons. With time, the S19 replaced many courses of the S13, eventually leading to the total replacement of the S13 through the S19. In 2025, it is planned to reestablish the S13 as an separate line to the S19.^{[citation needed]} The S13 is planned to operate between Bonn-Beuel and Düren every 20 minutes, while the S19 is planned to operate between Au (Sieg) and Köln-Nippes every 20 minutes.