In 1895, construction began on the
Usingen Railway (), now the
Taunus Railway (
Taunusbahn), to connect Friedrichsdorf and the
Taunus communities with Frankfurt in order "to bring the backwardness of the region to an end." It ran a single track from the Usinger Bahnhof (“Usingen station”) in
Bad Homburg via Seulberg to Friedrichsdorf and continued via Köppern into the Taunus. During its construction, Friedrichsdorf station was planned as a through station. Already plans had been developed for another rail connection between Friedrichsdorf and the
Main–Weser Railway. The
Friedberg–Friedrichsdorf railway was not opened until 1901. Its construction lead to the upgrading of the whole line from Frankfurt via Friedrichsdorf to Friedberg in order to increase its capacity, at the personal request of
Emperor Wilhelm II, including its duplication from 1907 until 1910. Initially there were two passenger tracks and a freight track at the station. To the south towards Seulberg, a wooden bridge was built across the tracks. The station building is west of the tracks. It consists of a central building with two floors and two lateral extensions and is very similar to Usingen station. The line was soon carrying freight. Especially in freight operations, excess demand often caused delays. Later, direct sidings were built to local firms.
Rühl AG & Co. and the
Tettauer glass works both had a siding. The main operation of the glass works was established in Friedrichsdorf in 1945, as the rail connection to its original plant in
Tettau was cut by the establishment of the
inner-German border (even though it was in
Bavaria). On 27 September 1970, electric services began running on the line to Friedrichsdorf. In addition, seven years later a
relay interlocking was built in Bad Homburg, controlling the area from
Weißkirchen and extended to Friedrichsdorf in 1978. The trains on the lines from
Grävenwiesbach (the
Taunus Railway) and
Friedberg (the
Friedberg–Friedrichsdorf railway) now mainly ended in Friedrichsdorf. In 1974, operations of an
S-Bahn-like service as line R5 began on the line between
Frankfurt Central Station and Friedrichsdorf with its inclusion in the
Frankfurter Verkehrs- und Tarifverbund (Frankfurt Transport Association, the forerunner of the
Rhein-Main-Verkehrsverbund between 1974 and 1995, FVV). This evolved in 1978 into the current
line S5 of the
Rhine-Main S-Bahn. In 1992, the line of the Usingen Railway from Friedrichsdorf to Grävenwiesbach was reactivated in 1993 as the “T-Bahn” and supported by the FVV. The trains now continued to Bad Homburg. Since the take-over of operations by the
Rhein-Main-Verkehrsverbund (Rhine-Main Transport Association, RMV), no Taunus Railway services now terminate in Friedrichsdorf. ==Infrastructure==