Koralm Tunnel

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Koralm Tunnel
Koralmtunnel westportal 20071104.jpg
Western entrance
Line Koralmbahn
Location Styria/Carinthia (Austria)
Coordinates 46°45′12″N 15°1′52″E / 46.75333°N 15.03111°E / 46.75333; 15.03111Coordinates: 46°45′12″N 15°1′52″E / 46.75333°N 15.03111°E / 46.75333; 15.03111
Status under construction
Start Frauental
End Sankt Andrä
Work begun 2008
Opens ~2022
Traffic railway
Length 32.9 km
No. of tracks 2 single-track tunnels

The Koralm Tunnel is a railway tunnel that is under construction in Austria under the Koralpe mountain range. It is expected to be operational by 2022.

The tunnel will be 32.9 km (20.4 mi) long, which will make it Austria's longest railway tunnel.[1][2] Running at depths of up to 1,250 m (4,100 ft) below ground, the tunnel will be a part of the 130 km (81 mi)-long Koralm Railway which will link Graz with Klagenfurt. The Koralm tunnel will be composed of two tunnels running in parallel, each capable of carrying a single railway track, which will be linked together every 500 metres (1,600 ft).

An emergency stopping point at the middle of the tunnel is included in the plans.


  1. ^ Johannes Fleckl-Ernst: Geodätische Herausforderungen beim Projekt „Koralmtunnel“. In: Felsbau, Heft 5/2010, S. 315–321, ISSN 1866-0134.
  2. ^ Drehscheibe März 2013, Seite 9

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