Line 31 to Schlieren is the only trolleybus line to cross one of Zürich's city borders.
Zurich | Zürich | University of Zurich | ETH Zurich | Zurich Opera | FC Zürich | Canton of Zürich | Zurich Chamber Orchestra | University of Zürich | Grasshopper Club Zürich | Zürich S-Bahn | Zurich Insurance Group | Zürich Hauptbahnhof | Weltklasse Zürich | Tonhalle Orchester Zürich | Lake Zurich | Trolleybuses in Salzburg | Pfäffikon, Zurich | Kunsthalle Zürich | ETH Zürich | Canton of Zurich | canton of Zurich | Zürich Opera House | Zurich Opera House | Zurich Airport | Trolleybuses in Arnhem | St. Peter, Zürich | Seebach (Zurich) | Schauspielhaus Zürich | Lake Zurich, Illinois |