A year later the project was granted by the authorities of the canton Aargau, but was not executed, mainly due to disagreements over the exact line through the narrow valley.

Eventually the section between Beinwil am See and Menziken was built and opened in 1883 by the Seetal Railway (now SBB).

Here, however, from the beginning on, a narrow gauge electrically powered line was planned, in the largest part of the route to be operated as a tramway.

A company by the name of the Aarau-Schöftland Railway (AS) was created to operate the new line, and Brown, Boveri & Cie (BBC) received the license and soon thereafter the construction works began.

A company by the name of the Wynental Railway (WTB) was created to operate the new line and in January 1903 construction works were started.

Both lines had their starting point in the street on the north side of SBB's Aarau railway station.

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

[2] The new company faced two challenges; the fact that its two lines were not physically connected and the impact on services caused by increasing motor traffic interfering with its still largely street running tracks.

[citation needed] The Suhrental branch first leads to a short tunnel, then follows the main road via Unterentfelden, Oberentfelden, Muhen, Hirschthal to Schöftland.