Sieg Railway
The original Siegburg station opened in 1859 on the Sieg Railway (). In 1870, Siegburg became the northern end of the East Rhine Railway ("Rechte Rheinstrecke"), with the intention that it would be later extended through the Agger valley through the Ruhr to Bochum or Essen, so that Siegburg would become a significant railway junction. Influential people in Cologne finally prevailed, so instead the East Rhine Railway was extended from Friedrich-Wilhelms-Hütte to Troisdorf in order to connect to Cologne, resulting in the line to Siegburg becoming only a branch line parallel with the Sieg Railway. This line was opened in 1872 and closed in 1884. The terminus of this line, the "Rheinische Bahnhof" (Rhenish station), named after its operator, the Rhenish Railway Company ("Rheinische Eisenbahn-Gesellschaft"), was next to the station of the Sieg Railway of the Cologne-Minden Railway Company ("Cöln-Mindener Eisenbahn-Gesellschaft") on a site later used as a freight depot. In the same year, the Siegburg–Olpe railway (or Agger Valley Railway) via Overath and Dieringhausen to Olpe was opened. With the opening of the direct Köln-Kalk–Overath railway in 1910, the Siegburg–Olpe line lost its importance and it has no longer been used for passenger services since 1954. In 1897, a narrow gauge line was built by the Brölthaler Eisenbahn-Actien-Gesellschaft (Bröl Valley Railway Company) to its own station south of Siegburg station; this was closed in 1955. In 1911, the Siegburg Railway ("Siegburger Bahn") was opened, which is now operated as part of the Bonn Stadtbahn. In 1914, the Siegburg–Zündorf Light Railway ("Kleinbahn Siegburg–Zündorf") was opened, but the Siegburg–Troisdorf section of it was closed in 1963.