Austria/Italy

Brenner Base Tunnel – Construction Progress

Plan of the Brenner Base Tunnel from 2024 Credit/Quelle: BBT SE
Plan of the Brenner Base Tunnel from 2024
Credit/Quelle: BBT SE
After around 26 months of tunnelling, TBM Ida completed the first breakthrough of the main tunnel bore on the Austrian side at the end of August 2025 Credit/Quelle: BBT SE
After around 26 months of tunnelling, TBM Ida completed the first breakthrough of the main tunnel bore on the Austrian side at the end of August 2025
Credit/Quelle: BBT SE
Completion of the western main tunnel on the Italian side of the Brenner Base Tunnel on May 2, 2025 Credit/Quelle: BBT SE
Completion of the western main tunnel on the Italian side of the Brenner Base Tunnel on May 2, 2025
Credit/Quelle: BBT SE
Breakthrough of the western main tunnel bore of the Brenner Base Tunnel on May 31, 2025, in the Austrian construction section Pfons–Brenner Credit/Quelle: BBT SE
Breakthrough of the western main tunnel bore of the Brenner Base Tunnel on May 31, 2025, in the Austrian construction section Pfons–Brenner
Credit/Quelle: BBT SE
On July 19, 2025, the last segment left the production facility in construction lot H41 Sill Gorge–Pfons Credit/Quelle: BBT SE
On July 19, 2025, the last segment left the production facility in construction lot H41 Sill Gorge–Pfons
Credit/Quelle: BBT SE
By early July 2025, 200 kilometers of the BBT tunnel system had been excavated (lines marked in blue = tunnelling completed) Credit/Quelle: BBT SE
By early July 2025, 200 kilometers of the BBT tunnel system had been excavated (lines marked in blue = tunnelling completed)
Credit/Quelle: BBT SE

The Brenner Base Tunnel (BBT) is a flat railway tunnel currently under construction that will connect two countries. It runs between Innsbruck (Austria) and Fortezza (Italy) and is 55 km long. In May 1994, a railway bypass, the so-called “Inntal Tunnel,” was opened south of Innsbruck. This 12.7 km long tunnel connects to the Brenner Base Tunnel.Passenger and freight trains traveling on this route therefore travel through the Inntal Tunnel for several kilometers in addition to the BBT. These 64 kilometers of tunnels will become the longest underground railway connection in the world. The BBT...

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Issue 05/2024

Breakthrough and Launch Ceremony at the Brenner Base Tunnel

Of the tunnel system, which is over 220 km long in total, 180 km have currently been driven – 80 km of which are main tunnels, 56 km exploratory tunnels and 44 km access, rescue and logistics...

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Italy

Brenner Base Tunnel: TBM Drives of the Main Tunnels in Italy Completed

Flavia, the last of three Herrenknecht machines, arrived at the national border at the Brenner Pass at a depth of around 1400 m and completed the drive in the western main tunnel for the H61 Mauls...

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Issue 04/2017 Austria

Brenner Base Tunnel: Breakthrough in both connecting Tunnels to Innsbruck Railway Bypass

Excavation is complete on both connecting tunnels that link the Innsbruck railway bypass, which has been operational since 1994, with the Brenner Base Tunnel. In mid-May 2017 the breakthrough of the...

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Issue 02/2023 Austria/Italy

Brenner Base Tunnel: TBM Virginia Has Reached the Brenner

After 4 years, the first tunnel boring machine (TBM) of a main tunnel in the Brenner Base Tunnel successfully completed driving on 30 March 2023. TBM Virginia covered around 14 km on its journey,...

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Austria

Brenner Base Tunnel: Breakthrough of the West Main Tunnel in the Austrian Pfons–Brenner Construction Lot

The breakthrough took place north of the geologically challenging Hochstegen area, around 1200 m below the Padauner Kogel in the municipality of Steinach. The main tunnel east was already broken...

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