The Semmering Base Tunnel (SBT) is about 27.3 km long and driven from the portal at Gloggnitz and three intermediate construction accesses in Göstritz, Fröschnitzgraben and Grautschenhof. The main components of the tunnel system are two single-track tunnels, cross passages at a maximum distance of 500 m and an emergency station in the middle tunnel section, with two ventilation shafts with a depth of approx. 400 m in case of an incident. For reasons concerning organization, timetable and topography, the tunnel is divided into four construction contracts.
Construction work of the tunnels started in 2014. By autumn 2023 98% of the tunnel excavation is completed. In the landfill site in Longsgraben, where most of the excavated material is deposited, recultivation started.
The presentation highlights the current state of the project, present achievements, and an outlook to further works.
History is being written in the Semmering region. The construction of the 27.3 km tunnel in the heart of Austria creates a modern rail link for future generations that also instantly makes rail travel in the south of Austria considerably more appealing. As part of the Baltic-Adriatic Corridor, the Semmering Base Tunnel is also a major section within international rail networks.
Future rail traffic can travel through the mountain at a top speed of 230 km/h after the completion of the tunnel. Freight transport is also much easier and more efficient with the Semmering Base Tunnel, as the steep inclines and narrow curve radii on the historic mountain route are eliminated and long freight trains can also be towed with just one locomotive in the tunnel. However, the historic mountain route will be preserved.
Together with the other upgrades along the new Southern Line between Vienna and Villach, the Semmering Base Tunnel represents an important, sustainable investment for the future. From 2030 onwards, it will be simpler and more appealing to make the switch from cars to railway. In doing so, it will be a useful contribution to climate protection.