It forms part of a trunk route from the Ruhr region to Bavaria via the Ruhr–Sieg railway, the Dill Railway and the Main–Weser Railway from Giessen to Friedberg via and continuing from Hanau via the Main–Spessart Railway.
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The Cologne-Minden Railway Company built the 183 kilometre long railway between 1859 and 1862 from Deutz via Betzdorf, Dillenburg and Wetzlar to Gießen, with a branch to the mines in Siegen.
It now forms the northern part of the Sieg Railway between Cologne Deutz station and Betzdorf, the Heller Valley Railway between Betzdorf and Haiger and the southern part of the Dill Railway between Haiger and Gießen.
The station was opened on 10 January 1861 simultaneously with the opening of the branch line from Siegen to Betzdorf, now part of the Sieg Railway.
Spich station is a railway junction in the district of Spich of the town of Troisdorf in the German state of North Rhine-Westphalia, on the Sieg Railway.
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.