The central section of the Deutz–Giessen line ran from Betzdorf via Burbach and Würgendorf to Haiger, the route of the current Heller Valley Railway.
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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.
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.
Haiger station is on the Siegen–Gießen main line (Dill line) and the Heller Valley Railway from Haiger to Betzdorf, now classified as a single track main line, which was originally part of the Deutz–Giessen line.