Koralm Railway


The Koralm Railway is a 127 km-long double-track, electrified, high-speed railway that is under construction, and which will connect the Austrian cities of Graz and Klagenfurt. Construction started in 2001, and the entire railway line is expected to be operational by 2025.

Overview

Although construction will not finish until 2025, parts of the railway line are already open, or will be opened earlier, to enhance the quality of local commuter rail services. The railway is primarily built for intermodal freight transport but will also be used by passenger trains travelling at up to 250 km/h. The travel time from Klagenfurt to Graz will be reduced from three hours to 45 minutes. Commissioning of the first new track section began in 2010 and construction is expected to be completed in 2022.
The centrepiece of the new railway is the 33 km Koralm Tunnel under the Koralpe mountains that give the railway its name. The project is currently the largest under way to expand the Austrian railway network with a budget of several billion euros, and will connect the federal state capitals of the adjacent states of Styria and Carinthia. The connection is possible via a three-hour train journey via Bruck an der Mur, though ÖBB currently runs Intercitybus services between Graz and Klagenfurt via Wolfsberg at a frequency of approximately two hours with a journey time of two hours. In combination with the projected 27 km-long Semmering Base Tunnel the Koralm Railway will remove bottlenecks in the Austrian freight and passenger railway infrastructure. Together with the existing Italian Pontebbana railway line between Tarvisio and Udine they will be part of what is referred to as Baltic-Adriatic Corridor - a traffic axis connecting the Polish port city of Gdańsk and the Italian city of Bologna. In 2013 the Koralm Railway was integrated into the Trans-European Transport Core Network.
Currently, the fastest Vienna-Graz and Vienna-Klagenfurt journeys on the Railjet services are 2h35m and 3h55m, respectively. If the Koralm railway enables Graz-Klagenfurt journeys of 0h45m, this will bring Vienna-Klagenfurt journeys down to 3h20m, a saving of 0h20m. In conjunction with the Semmering Base Tunnel and the upgraded Pottendorfer Line, Vienna-Klagenfurt journeys of 2h40m will be possible. The current railway layout makes it difficult for services to and from Vienna to simultaneously serve both Graz and Klagenfurt. Unless trains backtrack to Bruck an der Mur, the shortest railway route between the two cities runs via Maribor, Slovenia. As a result, ÖBB currently serves Graz and Klagenfurt with separate Railjet services. The Koralm Railway will make it significantly easier for ÖBB to connect both cities to Vienna with the same Railjet services, making increased service frequencies for these two cities possible.

Sections

Graz - Feldkirchen

Between Graz and Feldkirchen the Koralm Railway meets the Southern Railway line connecting Vienna with Slovenia. This stretch was upgraded in order to meet High-speed rail and S-Bahn standards. Specifically, level crossings were replaced by undercrossings and train stations were upgraded with some of them now serving as interchanges to other transport modes. The urban tram and bus services of Graz were extended to provide direct links from the train stations Graz-Don Bosco and Graz-Puntigam to the city centre. Graz Hauptbahnhof is currently being upgraded to meet the expected increase in railway traffic following the opening of the Koralm Railway and the extension of the Southern Railway between Graz and Slovenia from a single to a two track railway line.
Features:
After crossing the Süd Autobahn the Koralm Railway branches off the existing Southern Railway tracks. Immediately after the junction a 3 km-long subsurface route will be erected which will also include a station serving Graz Airport. Reemerging on the surface the tracks will then cross the Grazer Feld plain and subsequently follow the Pyhrn Autobahn. South of the Container terminal Werndorf two junctions to the existing Southern Railway line will be built - the first to integrate the container terminal, the second will serve as a connection for local railway services. After undercrossing the Pyhrn Autobahn and going through the 1.7 km-long Hengsberg Tunnel the Koralm Railway will arrive at Wettmannstätten. In December 2010 the 14 km-long section from Weitendorf junction to Wettmannstätten was opened as a single track, non-electrified railway. It is integrated in the Styrian S-Bahn system as S6 , cutting the journey time from Deutschlandsberg to Graz main station by 15 minutes. When the entire Koralm Railway becomes operational this stretch will be upgraded to two tracks and become electrified.
Features:
This section includes the 33 km-long Koralm Tunnel undercutting the Koralpe, an up to 2000 m high mountain range separating Southern Styria and Eastern Carinthia. Before reaching the eastern portal of the tunnel the Koralm Railway crosses the Laßnitz valley on a 10 km open land stretch, incorporating the future structures of the train station Weststeiermark. The station will serve as the regional hub connecting existing local railway lines with the Intercity traffic running over the Koralm Railway. It will also harbour the safety and maintenance installations of the Koralm tunnel.
The Koralm Tunnel itself will consist of two single track tubes with cross-passages every 500 m and an emergency station halfway its total length of 33 km. The construction of the tunnel is divided into three sections : KAT1, KAT2 and KAT3.
Features:
This section between the western portal of the Koralm tunnel at Sankt Andrä and Aich includes the future Lavanttal station, which will serve a similar role as the Weststeiermark station on the Styrian side of the Koralm, that is, connecting the Koralm Railway with local train and bus services. After crossing the Lavanttal the Koralm Railway will enter a series of tunnels with a total length of around 6 km. Preparatory works started in 2008, which included the construction of bridges, highways and the diversion of a section of the Lavant river and a part of the Lavanttal railway. The construction of the tunnels began in March 2015.
Features:
This section between the Jauntal bridge and Althofen an der Drau, which includes a bridge crossing the river Drau.
Features:
This section between Althofen an der Drau and Klagenfurt's main station closely follows the existing regional railway line. Construction started in 2001, had to be stopped however after a legal appeal over environmental risk assessments. In 2003 works resumed and could be finished in 2007 as a single track, non-electrified railway. The route of this section follows entirely a section of the Drautal Railway, which was built in the 1860s and connected Maribor to Franzensfeste.
Features: