Zimmerberg Base Tunnel, railway tunnel in northeastern Switzerland
The Zimmerberg Base Tunnel is a railway tunnel in Switzerland that runs under the mountains near Zug and Zurich and stretches just under 10 kilometers long. It features two standard-gauge tracks inside and allows both passenger and freight trains to travel at speeds up to roughly 100 miles per hour (160 kilometers per hour) while avoiding steep mountain grades and complex routes.
Construction of the tunnel began in 1997 and was completed in April 2003, using large tunnel boring machines and explosives to break through the rock. The project was part of a larger plan called NRLA, which aimed to help trains cross the Swiss Alps more easily and strengthen the entire rail network.
The tunnel is viewed locally as a testament to Swiss engineering prowess and represents the country's mastery of tunnel construction. For passengers traveling through it, the structure symbolizes the teamwork and innovation required to build such complex infrastructure.
As you enter the tunnel, you will notice smooth concrete walls and wide tracks in an open, modern space designed to handle heavy daily traffic at high speeds. The tunnel is served by electric trains powered at 15,000 volts, keeping journeys environmentally friendly and steady throughout the passage.
During construction, engineers had to work with special techniques such as soil injection and grouting because the land beneath large cities is full of underground pipes and existing buildings. The project was notable because it was finished on schedule despite these challenges, which is not always common with such large construction efforts.
The community of curious travelers
AroundUs brings together thousands of curated places, local tips, and hidden gems, enriched daily by 60,000 contributors worldwide.
