The Aargau Southern Railway completed the line on 1 June 1882.

[2] SBB electrified the line at 15 kV  16.7 Hz AC in 1927, completing the work on 5 May.

[4] In December 2023 a new connecting track was completed between Birr and the Heitersberg line, enabling direct access to Mägenwil.

This line will be used by freight traffic and enable more frequent service on the S11 between Mägenwil and Aarau.

The S23 uses the line between Othmarsingen and Brugg, combining with the S25 for half-hourly service between those stations.