Constructional changes are being planned on the SOB rail line from Häggenschwil-Winden to Wittenbach. The clearance requirements for various crossings are not met, which is why it is intended to examine whether a lowering of the track can be implemented or whether the construction should be dismantled without replacement or rebuilt.

Grundbauberatung-Geoconsulting AG is currently carrying out subsoil investigations to provide the geotechnical basis for further planning (condition of the track bed, substructure, and subsoil) and for decision-making (lowering, deconstruction or reconstruction). At the same time, investigations into soil and subsoil contaminations resulting from rail operations are in progress.