S10 (ZVV)

Uetliberg railway line (S10)
View down the line towards Zürich from Triemli, showing gradient
Overview
Type	Heavy rail with light rail attributes, carrying an S-Bahn service
System	Zürich S-Bahn
Status	Operational
Locale	Zürich, Switzerland
Termini	Zürich HB Uetliberg
Stations	9
Services	1
Operation
Opened	1875
Owner	Sihltal Zürich Uetliberg Bahn
Operator(s)	Sihltal Zürich Uetliberg Bahn
Depot(s)	Giesshübel
Technical
Line length	10.3 km (6.4 mi)
Number of tracks	Mixture of single and double track
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge
Electrification	1200 V DC overhead wire
Maximum incline	7.9%
Route diagram km elev -1.2 Zürich Hbf(Platforms 1–2) 396 m Sihltunnel1296 m -0.2 Zürich Selnau 398 m 0.0 Zurich Selnauformer terminus 414 m Sihlbrücke Giesshübel (96 m) link line to Zurich Wiedikon 1.1 Zurich Giesshübelnot served Sihltal line to Sihlbrugg 1.4 Zürich Binz 421 m 1.9 BorrwegKreuzungsstelle 435 m 2.2 Zürich Friesenberg 446 m 2.6 Zürich Schweighof 459 m 3.2 Zürich Triemli 485 m 4.4 BerghofKreuzungsstelle 543 m 5.8 Uitikon Waldegg 620 m 7.0 Ringlikon 682 m 9.1 Uetliberg 813 m

The Uetliberg railway line (German: Uetlibergbahn) is a passenger railway line which runs from the central station in the Swiss city of Zürich (Zürich Hauptbahnhof) through the city's western outskirts to the summit of the Uetliberg. The route serves as line S10 of the Zürich S-Bahn, with the Zürcher Verkehrsverbund's (ZVV's) standards zonal fares applying.

The line was opened in 1875 and electrified in 1923. In 1990 it was extended to its current terminus at Zürich Hauptbahnhof. Today it is owned by the Sihltal Zürich Uetliberg Bahn, a company that also owns the Sihltal line, and operates other transport services.

The line has a maximum gradient of 7.9% and is the steepest standard gauge adhesion railway in Europe. It carries both leisure and local commuter traffic.

The Uetliberg line was built by the Uetlibergbahn-Gesellschaft, which opened its line from Selnau station in Zürich to the summit of the Uetliberg mountain in 1875. In 1892 the Sihltal line was opened by another company, running from the Uetliberg line's Selnau station to Sihlwald.

In 1920 the Uetlibergbahn-Gesellschaft became bankrupt and was liquidated. Two years later the line was taken over by the Bahngesellschaft Zürich–Uetliberg (BZUe), and one year after that it was electrified. The original electric rolling stock had many of the attributes of contemporary tramcars, and were designed to be regaugeable to metre gauge as there was a, never realised, plan to integrate the line with the Zürich tram network.