The Sackbahnhof (sack station) on the Rhine shore was in the immediate vicinity of Nassau's main customs office and from 1839 allowed the immediate clearance of goods transported from Höchst am Main (the temporary rail head on the Taunus Railway) to Biebrich through customs for shipping on the Rhine.

The northwestern part of the station connects to the East Rhine Railway, which has very heavy freight train traffic.

These trains run through Wiesbaden Ost on the western side of the platforms and connect to the southern tracks of the Taunus Railway towards Mainz-Kastel.

To eliminate this bottleneck, a single-track connecting curve from the former Igelstein junction on the Mainz freight bypass to the East Rhine Railway has been under construction since early 2011 under the “seaport hinterland transport emergency program” (Sofortprogramms Seehafenhinterlandverkehr).

[8] The curve allows all freight trains through the district of Mainz-Kastel to run via the bypass, avoiding conflict with regional passenger services.

The primary measures include the replacement and disposal of soil contaminated with chlorinated polycyclic aromatic hydrocarbons.

[9] As a further preparatory action, a set of points was installed in October 2011 to give freight trains access in the future to the connecting curve.