Zimmerberg Base Tunnel

The 104th longest tunnel in the world

9.4 km · Length

The Zimmerberg Base Tunnel (ZBT) is a railway tunnel under the Zimmerberg mountains in Switzerland. Phase I of the tunnel was opened to traffic during April 2003. The ZBT has been divided into two phases of work; as of 2024, only Phase I is operational while Phase II remains in the planning and preparation stages. Zimmerberg I is about 10 km long; it links Zürich with Thalwil, bypassing a section of the Lake Zürich left-bank railway line, which allows rail traffic to traverse the mountains more efficiently.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

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