 After Seulberg, where the Taunus Railway services to and from Frankfurt mostly do not stop, the Taunus Railway reaches Friedrichsdorf, the terminus of the RB 16 and the S5 services.This is the start of a moderate climb past the former Industrial siding from Rühl Chemie and the Tettauer glassworks to the first crossing station at Köppern, which has a short loading track next to the platform tracks.The line passes through the main ridge of the Taunus in the Köppern valley, following the Erlenbach, and passes through Saalburg station, which was designated as "Saalburg/Lochmühle" from 1993 to 2008, and the Limes.