| Suburban line | |
| Native Name: | Vorortelinie |
| Native Name Lang: | de |
| Locale: | Vienna |
| Owner: | ÖBB |
| Linelength Km: | 14 |
| Map State: | collapsed |
The Suburban line (de|Vorortelinie) is a railway line in the city of Vienna. It runs approximately from to, running around the northwest side of the city. It hosts the S45 service of the Vienna S-Bahn.
The line begins at, and runs parallel to the Western railway line to . Beyond Wien Penzing, the Western railway line continues east to Wien Westbahnhof, while the Suburban line turns to run northeast, partially in tunnel, to . Just before Wien Heiligenstadt, it crosses the tracks of the Franz-Josefs-Bahn, which will continue north to follow the Danube. After leaving Wien Heiligenstadt, the Suburban line crosses the Donaukanal and turns southeast and joins the Donauuferbahn, which also follows the Danube.
See main article: S45 (Vienna S-Bahn). Passenger services on the Suburban line are provided by the S45 of the Vienna S-Bahn, which runs between Wien Hütteldorf and on the Donauuferbahn via Wien Heiligenstadt. Trains operate every 10 minutes.[1]