Koralm Tunnel
Austrian railway tunnel
The Koralm Tunnel (Koralmtunnel) is a railway tunnel in Austria under the Koralpe mountain range. It forms one section of the 130 km (81 mi)-long Koralm Railway which links Graz with Klagenfurt. With a length of 32.9 km (20.4 mi),
it is Austria's longest railway tunnel and runs at depths of up to 1,250 m (4,100 ft) below ground. It comprises a pair of tunnels running in parallel, each capable of carrying a single railway track, which are linked together every 500 metres (1,600 ft).
The Koralm Tunnel was officially opened on December 12, 2025, with regular service starting on the 14th.
History
The Koralm Tunnel is perhaps the most significant engineering feature of the Koralm Railway, Austria's most southern line. The route is designed to allow a maximum speed of 250 km/h wherever economically feasible, to shorten journey times between Vienna and Klagenfurt via Graz by over an hour for an estimated journey time of two hours and 40 minutes. It also improves rail freight between ports on the Adriatic and Baltic Seas. Numerous regional figures in Styria have promoted the tunnel's construction as helping to address the comparatively limited railway infrastructure of the mountainous region compared with the rest of Austria and that, once in service, the tunnel ought to bring considerable economic benefits and investment to local businesses.
During 1995, the Austrian Government authorised the Austrian Federal Railways to proceed with the planning and designing of the Koralm Railway, including the Koralm Tunnel; in addition to finalising the route selection and legal preparations, extensive environmental surveys were conducted.
“Koralm Tunnel” enters the record as austrian railway tunnel. Crown Archives preserves that source wording while asking what Koralm, Tunnel and Austrian can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 19, 2026. The linked authority identifier is Q444771. Authority coordinates are 46.753, 15.031. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2025 and 1995.
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This entry incorporates text from “Koralm Tunnel” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.