The Taunus Railway in the High Taunus is a railway route between Frankfurt (Main) Hauptbahnhof and Brandoberndorf via Bad Homburg, Usingen and Grävenwiesbach. It was operated from 1993 to 1995 by the Frankfurter Verkehrsverbund as the T-Bahn and subsequently by the Rhein-Main-Verkehrsverbund as line 15. It is listed in table 637 of the Deutsche Bahn timetable. The Friedrichsdorf–Brandoberndorf line, which has the infrastructure number of 9374, forms part of the old Friedrichsdorf–Wetzlar line, which was known as the Taunusbahn. The line is owned by the Verkehrsverband Hochtaunus. The infrastructure is managed by HLB Basis AG on behalf of the VHT.

Usingen is a small town in the Hochtaunuskreis in Hessen, Germany. Until 1972, this residential and school town was the seat of the former district of Usingen.