used only as an operating route and is only suitable for this, as it does not lead to the actual track rails, but on a siding. South of the station, the Senckenberg Museum of Natural History used the tunneling work to construct an underground two-storey warehouse complex that extends across the entire width of the Senckenberganlage and also has an emergency exit in the subway tunnel. Bockenheimer Warte: The station Bockenheimer Warte itself was built in two sections. The northern part with the lying on level C tracks of the C route was completed in 1986. At that time, the intersecting elements of the D line and a direct connection between the two platforms were already being built. In contrast, the entire southern part of the station building with the lower tracks of the D line was only built in 2001. As at the train station Festhalle / Messe, the station of the D route received a very high platform hall. Here, however, were not design plans the cause, but the intention of the University to set up over the actual station another camp of the University Library. With the decision to abandon the campus Bockenheim in the medium term, the plans became obsolete and the existing spatial situation arose. The planned route to Ginnheim Nord of the station is a four-track turning facility, which reaches just past Sophienstraße. If necessary, continuation (D II) would follow on the outer tracks. This is the reason for the abundant equipment with tracks, because it should then continue to be turned around. Planning Stages Bockenheimer Warte - Ginnheim (Line D I) The second planned construction phase of Line D, is to connect at the station Bockenheimer waiting to the 2001 opened route. For an underground course along the tram line 16 was initially provided. Behind the Bockenheimer Warte, the planned tunnel should first follow the course of the Zeppelinallee, first under some apartment blocks north of the Sophienstraße and merge at the height of the Georg-Speyer-Straße into the Franz-Rücker-Allee. Here, the route would have reached the existing route of the tram line 16, the course of which they would have largely followed on the remaining stretch to Ginnheim. At the level of the Frauenfriedenskirche, the first intermediate station named Franz-Rücker-Allee was to be built. An originally planned at this point tunnel ramp was later rejected after local protests. Instead, the tunnel would have