Sihltal Zürich Uetliberg Bahn

This extension involved the construction of a new rail tunnel from Selnau to Zurich HB, and a new underground intermediate station adjacent to the former terminus.

The underground platforms used at Zurich HB were already in existence, having been built prior to 1973 for a U-Bahn scheme that was ultimately rejected by voters.

Also operated is a connecting line from Giesshübel to the Swiss Federal Railways at Zürich Wiedikon, although this is normally only used for freight traffic.

In order to avoid conflict on the shared railway section, the Uetlibergbahn used an overhead line offset from the centre of the track, and its cars were equipped with specially designed, laterally displaced pantographs.

The cable car Luftseilbahn Adliswil-Felsenegg (LAF for short or commonly called Felseneggbahn) is operated by the SZU.

Additionally, the Zimmerberg bus line (German: Zimmerbergbus) in the district of Horgen, which provides a network of 166.5 km (103.5 mi) including 201 stops, is also operated by the SZU.

S4 service ( Sihltalbahn ) in the Sihl valley.
S10 service ( Uetlibergbahn ) at Uetliberg station.
Two overhead conductor rails for the same track. Left, 1200 V DC for the Uetliberg railway (the pantograph is mounted asymmetrically to collect current from this rail); right, 15,000 V AC for the Sihltal railway
Once the terminus of the SZU lines, Selnau station is now a through station on the line into Zurich Hauptbahnhof. As this line runs in a tunnel along and under the bed of the River Sihl , its access is via this structure in the river.