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Stadtbahn operation on line U9 (Voglsang - Hauptbahnhof
- Raitelsberg - Hedelfingen) began September 30, 1989 with 22
stations, but only nine with high-level platforms at that time
(because of mixed traffic with narrow-gauge trams). In 2004 high-level
platforms were built at all of the stations along the line U9.
Stadtbahn operation on line U4 (Botnang - Charlottenplatz -
Ostendplatz - Untertürkheim Bahnhof) began September 24, 1994, serving
28 stations. At that time, part-time service began on the U9 between
Vogelsang and Botnang. The U4 and U9 share the same route for most of
their length, with the exceptions being between Bergfriedhof and
Wangenerstraße/Landhausstraße, where the U4 and U9 take different
routes, and south-east of Wasenstraße where the lines diverge to
different terminals. U4-stations Ostendplatz, Tal-/Landhausstraße and
Gaiburg still have low-level platforms, high-level platforms will
be built in the next few years. U4 terminus Untertürkheim Bahnhof
provides a connection to S-Bahn-line S1.
There is a tunnel segment between Lindpaintnerstraße and Herderplatz
under Botnanger Sattel which is 550m long, with a maximum gradient of
4.8%, which was built by mine-tunneling with shotcrete
construction. It opened September 24, 1994, allowing the extension of
the line north-west of Voglsang.
The U4/U9 also use a portion of the downtown tunnel system serving stations
"Keplerstraße" and "Hauptbahnhof (Arnulf-Klett-Platz)". This 2300m
long tunnel opened on April 9, 1976. The U4/U9 enter the tunnel at via
a ramp Schloßstraße which replaced a former temporary ramp at Schillerstraße.
The station at Hauptbahnhof (Arnulf-Klett-Platz) is two levels down
and has four tracks and three platforms. The north pair of tracks are
used by the lines U9 and U14, the south ones by the lines U5, U6, U7
and tram line 15. Connection can be made to all S-Bahn-lines one level
down.
Other stations in the tunnel system can be seen in the description of line U2 (Berliner
Platz-Hohe Straße and Rotebühlplatz) and in the description of line U1 (Rathaus,
Charlottenplatz, Staatsgalerie, Neckartor and Stöckach).
(Click to enlarge)
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