At the heart of the Koralm railway project between Graz and Klagenfurt in Austria is the 33km-long Koralm Tunnel. The new 130 km high-performance line consists of 12 new stations, over 100 bridges and 47 km in tunnels. On the 14.08,2018 the joint venture between Strabag/Jaeger Bau celebrated the first breakthrough in the 33 km long Koralm tunnel with TBM Mauli 1. The two TBMs Mauli 1 (South tube) and Mauli 2 (North tube) have driven 17,127 and 17,145 m - up to 1,200 m below the surface and through stubborn fault zones.

The two TBMs were launched in January and March 2013 from Styria's Leibenfeld. Mauli 2 had already completed its trip in February 2018 and has been dismantled. The remaining 6 km to the second tunnel breakthrough will be taken over by another TBM called Kora, this TBM started in 2015 from the Carinthian Lavanttal.

The tunnelling work on the Stein, Lind, Peraschitzen and Srejach tunnels in Carinthia, some of which have very difficult geology, and the tunnelling work on the Granitztal tunnel chain, have been successfully completed. Click here and at/42 for tunnelbuilder archive.Visit https://infrastruktur.oebb.at/en/projects-for-austria/railway-lines/southern-line-vienna-villach/koralm-railway/tunneldurchschlag.

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