Location: Gotthard Tunnel Line, Switzerland
Focus: Rockfall detection at tunnel entrances
Technology Partner: INGLAS (Impact Sentinel system)
First installed: 2014
A Key Railway Through Alpine Terrain
The Gotthard Tunnel Line is one of Europe’s most important rail routes, connecting Germany and Italy through the Swiss Alps. It includes both the historic mountain route and the modern Gotthard Base Tunnel—currently the world’s longest railway tunnel. In 2014, rockfall detection systems were installed at several tunnel entrances along the line. These areas are especially vulnerable, as trains emerge from tunnels at high speed into steep terrain where falling rocks can pose serious risks.
Why Monitoring Was Needed
Tunnel exits in this region are surrounded by steep slopes. Snow, changing temperatures, and loose rock create ongoing risk of rockfall. For train drivers, visibility is limited, and response time is short—especially when exiting a tunnel at up to 200 km/h. Existing catch fences can become overloaded with snow or weakened by earlier impacts, making early warning systems essential. The video below shows rockfall at Axenstraße, Switzerland in partnership with Geopraevent, near the Gotthard tunnel entrance. Our sensors recognised and warned those in danger.
How the System Works
Sensors were placed near tunnel entrances to detect rock impacts and movement. If a rockfall occurs, the system immediately sends alerts to train operators and control centers. This allows trains to slow down or stop before reaching the affected area. The monitoring system was designed to handle the challenges of alpine conditions—long distances, harsh weather, and remote locations. It runs continuously and requires little maintenance. In 2023, the network was upgraded with newer sensors and communication technology.
Lasting Impact
The system now covers more than 200 km of rail and includes over 1,000 sensors. It plays a critical role in keeping the Gotthard line safe for both passengers and freight, every day of the year.
For more information about the monitoring technology and the team behind it, click here
