to replace the 1950s stock. In 2007, the terminus at Stadelhofen was realigned. Operation Route The line starts from at Stadelhoferplatz, outside the main line Stadelhofen station, where the line terminates on a loop with its own two platforms. The Forchbahn platforms are flanked by platforms for tram routes 11 and 8 of the Zürich tram system, which share tracks with the initial stretch of the Forchbahn. Between Stadelhofen and Rehalp, the Forchbahn trains use the tracks of the tram system, owned by the Verkehrsbetriebe Zürich (VBZ), which are electrified at 600 V DC and are largely situated in the street. Between these two points, Forchbahn trains serve intermediate tram stops at Kreuzplatz (where tram route 8 diverges), Hegibachplatz and Balgrist. At Rehalp tram route 11 has its terminus, and the Forchbahn trains enter the line's separate Rehalp station. Here they join the Forchbahn proper, which is electrified on the overhead system at 1200 V DC. From Rehalp to the Waltikon station the line uses a roadside double track alignment, and serves the intermediate stations of Waldburg, Spital Zollikerberg and Zollikerberg. Immediately after leaving Waltikon station, the line enters a double track tunnel under the village of Zumikon, serving the underground stations of Zumikon and Maiacher. The line surfaces just before entering Neue Forch station, where it resumes its roadside alignment. The next section of line, between Neue Forch and Forch, is single track, to be double tracked in the 2020s. The line's headquarters is situated at the 1970s Forch station, which includes a depot complex. After Forch the line passes under the motor way built 1970 before returning to its alignment alongside the old road. The remainder of the line is single track, and serves intermediate stations at Scheuren, Neuhaus bei Hinteregg, Hinteregg, Egg, Langwies and Emmat. All these stops include passing loops, with the exception of Langwies and Emmat. The line terminates at the modern Esslingen station, which has three tracks and an overall roof. Services The passenger services on the line forms part of the Zürich S-Bahn, branded as the S18. The standard Zürcher Verkehrsverbund (ZVV) zonal fare tariffs apply to the line. During the day, trains calling at all stops run every 15 minutes from Stadelhofen to Forch, with every second train continuing to Esslingen. At peak periods, four express trains per hour run to Esslingen without stopping between Rehalp and Forch, whilst another four trains