The line was built in the 1970s as part of the planned New Main Transversal (Neue Haupttransversale, NHT) project.

Outside of Othmarsingen, there is a three-level crossing with a cantonal road and branches running towards Hendschiken and Lenzburg.

West of Lenzburg a new line runs to Rupperswil and then it turns into a recently rebuilt four-track section to Aarau.

[4][5][6] In December 2023 a new connecting track was completed between Mägenwil and the Brugg–Hendschiken line, enabling direct access to Birr.

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