The Zug reversing loop, which made it possible to run from both directions into the station, was also built at that time.

The direct Zurich–Luzern trains now used the route via Thalwil, so that this branch of the Zurich–Zug–Lucerne Railway was reduced to a secondary line without long-distance passenger services.

[4] When it was decided to transfer shunting from the former marshalling yard on the approach to Zürich Hauptbahnhof to Zurich Mülligen (only fast goods and postal traffic) and to Limmattal marshalling yard, it was clear that this traffic would be eliminated.

For this reason, on 19 November 1970, the side of the rail triangle that connected Steinhausen with Cham was closed and dismantled.

Various upgrades to the stations and the track were necessary for the introduction of services to Affoltern am Albis at quarter-hourly intervals in 2007.

The intermediate stations at the opening were Urdorf, Birmensdorf, Bonstetten, Hedingen, Affoltern am Albis, Mettmenstetten and Knonau.

During the construction of the Zurich West Bypass and the A4 motorway, a siding was temporarily set up at Fildern.

The siding was equipped with a loading facility for receiving excavated material from the motorway tunnels at Aesch, Uetliberg and Islisberg in the area of the Zürich West junction.