double set shortly after
Neu-Anspach The line consists of part of the former
Deutsche Bundesbahn Frankfurt–Wetzlar (
Solmsbach Valley Railway) and Frankfurt–Weilburg (
Weil Valley Railway) lines, which were closed by Deutsche Bundesbahn beyond Grävenwiesbach. Today services on the Taunus Railway run on the extension of the
Homburg Railway to Friedrichsdorf, which they share with the S5 services. They continue to Brandoberndorf over the single-track and non-electrified line, which is the property of the Verkehrsverband Hochtaunus. In the peak hour, trains start and end every hour at Frankfurt Hbf. In contrast to the S5, the trains do not stop underground, but on the above-ground long-distance tracks. While the S5 services turn to run on the Homburg Railway immediately north of
Frankfurt West station, the Taunus Railway service (the RB 15) first runs on the regional tracks towards
Frankfurt-Höchst (
Taunus Railway) and then curves on the
Rebstock lands on a connecting curve (
Rebstockkurve) of the former
Bad Nauheim–Wiesbaden railway (
Bäderbahn) to join the route of the S5 shortly before
Rödelheim station. It follows the S5 service with only two stops in Rödelheim and Oberursel to Bad Homburg The regular interval services start In Bad Homburg. 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. An uphill section begins after
Wehrheim station, which also has a loading track. Over the hill, after passing an old brickyard (which once have a siding), a curved section leads to
Neu-Anspach, which was the only station that had been reduced to a halt (
Haltepunkt, that is, has no
sets of points) before the modernisation of the line. It was re-equipped with points in 1992. Just under a kilometre further is the halt of Hausen. A long run through open fields leads to
Usingen, where the line's central signal box is located and trains are stored, assembled, disassembled and refueled. This was formerly the location of the loading station of the 4 km-long
narrow-gauge railway to a
geyserite works (now
Bremthaler Quarzitwerk) and a siding from
Raiffeisen Waren-Zentrale Rhein-Main (an agricultural cooperative). The section with the steepest grade (up to 2.147%) begins there; Wilhelmsdorf station, which is at the end of it, is a good 390 metres above sea level. A narrow gauge railway branched off here against the direction of travel to Merzhausen military airfield (now used for the
Erdfunkstelle Usingen, Usingen earth station). After another slight climb past the junction of the
BGS camp, the line reaches its high point at the edge of the forest. From there it goes to
Grävenwiesbach, where some trains can be stored, and down around a loop to Hundstadt. The continuation of the line, on the route of the original
Solmsbach Valley Railway (
Solmsbachtalbahn), climbs past the former
Jägerhaus timber loading point, which was used in freight operations from 1913 to 1985 and for passenger traffic from 1954 to 1981, and immediately afterwards passes through the Hasselborn Tunnel, which passes through the border into the
Lahn-Dill-Kreis. The 1,300 m-long tunnel lies on a slight incline and is almost straight. During the war, it was originally supposed to be used for the safe storage of the special trains of
Adolf Hitler while he was in the nearby
Adlerhorst. Due to the increasing
air raids on Frankfurt around 1941, the VDM copper works at Heddernheim shifted parts of the war production here and used forced labourers, which is commemorated on a plaque near the south portal. Shortly after the end of the tunnel is the new halt of Hasselborn which was moved from the old station about 100 metres closer to the village in 1999. Behind it, the line continues descending, until the final station is finally reached in Brandoberndorf, which is in the municipality of
Waldsolms. It is located a few metres south of the old station. There are two unused sidings in the station area. The stations of Köppern,
Saalburg,
Wehrheim, Neu-Anspach,
Usingen and Wilhelmsdorf on the single-track section have two platform tracks, which are protected on both sides by exit signals, and allow trains to cross;
Grävenwiesbach has three tracks. These passing loops mean that the line has significant capacity. There is no crossing loop on the section between Grävenwiesbach and Brandoberndorf. == History==