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The D Line is a partially completed north‒south route of the Frankfurt U-Bahn. The line has been planned since the 1960s and as of 2021[update] three sections had been constructed and were in use for U-Bahn services, with another section of the planned route operated by trams. As the route is not continuous there are no through services, but parts of it are used by underground services U1, U4, U8, U9. The planned Ginnheim Curve (Ginnheimer Kurve) would run via Frankfurt University's Campus Westend to fill the gap.
The oldest section between Ginnheim and Heddernheim was constructed between 1968‒1978 as a branch of the A Line serving the Nordweststadt and carries U1 and U9 services. The central section between the main railway station and Bockenheimer Warte opened in 2001 and is operated as an extension of the U4 service from the B Line. The most northerly section has two stations serving new development in Riedberg and opened in 2010 and carries U8 and U9 services.[1]
South of the River Main between the University Hospital and Schwanheim the planned route of the D Line remains operated by low-floor trams but has mostly been upgraded run on reserved track.[citation needed]
- ^ "Oberbürgermeisterin Petra Roth eröffnet neue Riedberg-Linien U8 und U9" [Mayor Petra Roth opened new Riedberg lines U8 and U9] (in German). traffiQ. 12 December 2010. Retrieved 28 September 2024.