It is the principal intermediate point on the 1,000 mm (3 ft 3+3⁄8 in) gauge Schöftland–Aarau–Menziken line of Aargau Verkehr.

The station is the main point of transfer to the Swiss Federal Railways (SBB) lines, and is situated across Hintere Bahnhofstrasse from the south side of the SBB station.

Initially both lines had their starting point in the street on the north side of the SBB station.

In 1924, the WTB opened its own terminal station on the current WSB station site south of the SBB railway lines, whilst the AS continued running through the city streets to its stop on the north side, thus meaning that the direct connection between WTB and AS was lost.

[citation needed] In 2010 the section of the former WTB line between the station and Suhr, which ran in the street, was closed and replaced by a new route operating on the right of way of the closed SBB standard gauge branch that roughly paralleled the former route.