Siegstrecke
The frequency of services of the Rhine-Sieg-Express on the Sieg Railway is increased during the peaks. In the morning two extra trains run to Cologne and in the afternoon two extra trains run from Cologne towards Siegen. These additional trains run between Au (Sieg) and Siegen with stops in Etzbach, Niederhövels, Scheuerfeld and Brachbach. Between Cologne and Au they also stop in Dattenfeld and Rosbach.