Zimmerberg Base Tunnel

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 2020, only Phase I is operational while Phase II remains in the planning and preparation stages. Zimmerberg I is about 10 km long and links Zurich with Thalwil and bypasses a section of the Lake Zürich left-bank railway line, allowing rail traffic to traverse the mountains more efficiently than traditional routes.

Zimmerberg Base Tunnel

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 2020, only Phase I is operational while Phase II remains in the planning and preparation stages. Zimmerberg I is about 10 km long and links Zurich with Thalwil and bypasses a section of the Lake Zürich left-bank railway line, allowing rail traffic to traverse the mountains more efficiently than traditional routes.