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| Austrian Southern Railway | |
|---|---|
 | |
| Overview | |
| Native name | Südbahn |
| Status | Operational |
| Termini | |
| Service | |
| Type | Heavy rail, Passenger/Freight rail Regional rail |
| Operator(s) | Austrian Federal Railways Slovenske Železnice Rete Ferroviaria Italiana |
| History | |
| Opened | Stages between 1841 and 1857 |
| Technical | |
| Line length | 577.2 km (358.7 mi) |
| Number of tracks | Double track |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
| Minimum radius | 171 m |
| Electrification | 15 kV/16,7 Hz AC Overhead line (Austria) 3 kV DC Overhead line (Slovenia and Italy) |
| Maximum incline | 2.8% |
The Austrian Southern Railway (German: Österreichische Südbahn) is a 577.2-kilometre (358.7 mi) long double track railway, which linked the capital Vienna with Trieste, the former main seaport of Austria-Hungary, by railway for the first time. It now forms the Southern Railway in Austria and the Spielfeld-Straß–Trieste railway in Slovenia and Italy.