U-Bahn Line D (Frankfurt U-Bahn)
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U-Bahn Line D is a partially completed north‒south route of the Frankfurt U-Bahn underground rail network, planned since the 1960s. As of 2021[update] three sections had been constructed and were in use for U-Bahn services, plus a long section operated with trams. As the route is not continuous there are no through services, but instead underground services U1, U4, U8, U9 and tram lines 12, 15, 21 all partially serve some of the stops on the route then transfer to other routes. The planned Ginnheim Curve (Ginnheimer Kurve [de]) extension would run via the University's Campus Westend [de] to fill the missing gap.
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The most northerly section serving two stations on the new Reidberg settlement opened in 2010 and operates with U8 and U9 underground services.
The core northern section between Ginnheim station [de] and Heddernheim station [de] had been constructed between 1968‒1978 as a branch of the U-Bahn Line A serving Nordwestzentrum station [de] and operates with U1 and U8 services.
The middle section between the main railway station at Frankfurt (Main) Hauptbahnhof and Bockenheimer Warte station [de] opened in 2001 as an extension of U-Bahn Line B (U4 service).
South of the River Main between the University Hospital and Schwanheim the planned route remains operated by low-floor tram services but is mostly upgraded to light rail design running in its own reservation.