Line 4 is once again running its usual route from Altstetten Nord station to Bahnhofquai and from there via Central – Bellevue – Stadelhofen station to Rehalp. From Stadelhofen station, it is joined by another service. Line 5 now also runs to Rehalp during peak hours.
Line 4 is once again running at 7.5-minute intervals. On the section of the route shared with Line 5, you can therefore continue to board a service every 3.75 minutes during peak times.

The Bahnhofquai/HB stop is being extensively renovated and converted to make it barrier-free. It will therefore be closed for one year from 14 December 2025.