The S3 is a regional

railway Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in Track (rail transport), tracks. In contrast to road transport, where the ...

service of the

Zürich S-Bahn The Zürich S-Bahn (german: S-Bahn Zürich) system is a network of rail lines that has been incrementally expanded to cover the ZVV area, which comprises the entire canton of Zürich and portions of neighbouring cantons (Aargau, Glaru ...

on the Zürcher Verkehrsverbund (ZVV), the

Zürich , neighboring_municipalities = Adliswil, Dübendorf, Fällanden, Kilchberg, Maur, Oberengstringen, Opfikon, Regensdorf, Rümlang, Schlieren, Stallikon, Uitikon, Urdorf, Wallisellen, Zollikon , twintowns = Kunming, San Francisco Zürich () i ...

transportation network. It is operated by

Swiss Federal Railways Swiss Federal Railways (german: link=no, Schweizerische Bundesbahnen, ''SBB''; french: link=no, Chemins de fer fédéraux suisses, ''CFF''; it, Ferrovie federali svizzere, ''FFS'') is the national railway company of Switzerland. It is usuall ...

Route

* The core of the service links Wetzikon, in the east of the canton of Zürich, and Zürich Hardbrücke, in central Zürich. This core service runs via the Hinwil–Effretikon line, joining the Winterthur–Zürich line at

Effretikon Illnau-Effretikon is a municipality in the district of Pfäffikon in the canton of Zürich in Switzerland. It includes the villages of Illnau, Effretikon, Ottikon and Bisikon. On 1 January 2016 Kyburg and Illnau-Effretikon merged to form the mu ...

. It then runs via the Zürichberg Tunnel and stopping at

Zürich Stadelhofen , neighboring_municipalities = Adliswil, Dübendorf, Fällanden, Kilchberg, Maur, Oberengstringen, Opfikon, Regensdorf, Rümlang, Schlieren,