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| Koralm Railway | |
|---|---|
| Name | Koralm Railway |
| Locale | Austria |
| Start | Graz |
| End | Klagenfurt |
| Owner | Austrian Federal Railways (ÖBB) |
| Line length | 127 km |
| Gauge | Standard gauge |
| Electrification | 15 kV AC |
| Status | Under construction / phased opening |
Koralm Railway is a high-performance railway corridor linking the Austrian cities of Graz and Klagenfurt across the Koralm massif in the Alps. Designed to shorten travel times, improve freight capacity, and integrate regional services with the Semmering Base Tunnel and the Brenner Base Tunnel corridors, the project is a cornerstone of Austrian and Trans-European Transport Network rail strategy. The line features extensive tunnelling, including the landmark Koralm Tunnel, and interfaces with national operators such as ÖBB and international networks serving Italy, Slovenia, and Germany.
The Koralm Railway is a 127-kilometre standard-gauge, electrified main line intended to provide a high-speed passenger and heavy-freight link between Styria and Carinthia. Its primary engineering objective is to traverse the Koralm mountain range via the approximately 33-kilometre Koralm Tunnel, reducing journey times between Graz Hauptbahnhof and Klagenfurt Hauptbahnhof to around 45 minutes for express services. The project is part of Austria’s contribution to the TEN-T core network and complements alpine transalpine axes such as the Brenner Base Tunnel and the New Lower Inn Valley Railway.
The alignment begins near Graz, connects with the existing Southern Railway at Graz Hauptbahnhof, ascends through the Lavanttal and traverses the Koralm massif via the Koralm Tunnel, then descends toward Klagenfurt and the Wörthersee region. Major engineered structures include the dual-bore Koralm Tunnel, multiple intermediate tunnels, long viaducts spanning valleys, and portals integrating with regional nodes such as Deutschlandsberg and Weitensfeld im Gurktal. The infrastructure design incorporates continuous electrification at 15 kV 16.7 Hz AC and modern signalling consistent with ETCS specifications, enabling interoperability with S-Bahn Steiermark and long-distance ÖBB Railjet stock.
Construction has involved complex geotechnical investigations across metamorphic and sedimentary strata typical of the Eastern Alps, requiring tunnel boring machines, drill-and-blast methods, and extensive shotcrete and rock-bolting works. The Koralm Tunnel itself required advanced ventilation, emergency egress galleries, cross-passages, and grouting to manage groundwater inflows. International contractors and consortia, drawing experience from projects like the Gotthard Base Tunnel and the Gotthard Road Tunnel, deployed tunnel boring machines supplied by manufacturers such as Herrenknecht and engineering designs influenced by Austrian tunnelling practice codified in standards promulgated by institutions including the Austrian Standards Institute. Construction staging included access adits, temporary logistics yards, and concrete batching plants located near major portals.
Upon phased commissioning, services are planned to include high-speed intercity connections, regional commuter trains, and significant freight traffic. ÖBB intends to operate Railjet and InterCity services linking Vienna via Leoben and Bruck an der Mur to Klagenfurt and onward connections to Villach and Udine. The line’s capacity enhancements aim to shift alpine freight from road corridors such as the A2 (Austria) motorway to rail, servicing operators including DB Cargo and SBB Cargo for transalpine routes toward Trieste and Venice. Integration with ETCS Level 2 signalling and centralized traffic control will support mixed traffic at line speeds envisaged up to 250 km/h for passenger trains and heavy axle loads for freight.
Environmental assessments addressed impacts on alpine habitats, groundwater regimes, and protected areas including proximity to Natura 2000 designations in Styria and Carinthia. Mitigation measures encompassed tunnel alignment optimization to avoid sensitive surface ecosystems, construction water treatment plants, reforestation and habitat compensation schemes, and noise barriers near settlements like Gratkorn and Althofen. Economically, the project is projected to stimulate regional development, boost tourism to destinations such as Lake Wörthersee and the Nockberge, and support modal shift objectives of the European Green Deal by reducing heavy truck kilometres on A2 and other alpine motorways. Funding sources combine national budgets, EU Cohesion funds connected to TEN-T, and public-private arrangements.
Concepts for an improved east–west alpine railway through the Koralm region date back to early 20th-century proposals; however, modern development accelerated in the late 20th and early 21st centuries amid EU trans-European transport planning. Key milestones include feasibility studies by Austrian federal ministries, parliamentary approvals, and the awarding of major construction contracts in the 2000s and 2010s. Political stakeholders included the governments of Austria and regional administrations of Styria and Carinthia, with technical oversight from ÖBB infrastructure divisions and consulting firms experienced in alpine tunnelling. The project benefited from lessons learned on previous alpine megaprojects like the Lötschberg Base Tunnel and policy drivers such as the Alpine Convention.
Planned completions of remaining sections and system testing aim to realize full operational capability, with staged openings coordinated with the completion of complementary projects such as the Semmering Base Tunnel and upgrades to the Southern Railway. Future upgrades may include additional electrification feed points, capacity-increasing crossovers, station enhancements at nodes like Leibnitz, and digital signalling migration to full ERTMS implementation. Long-term network plans envision increased international freight flows to ports including Genoa and Trieste, expanded commuter services to growing suburbs around Graz, and integration with EU climate targets to further reduce CO2 emissions from alpine transport.
Category:Rail transport in Austria Category:Railway tunnels in Austria