Gotthard Tunnel Portal Monitoring : Sensors installed near tunnel entrances detect rockfalls where trains exit at high speed with limited visibility. Active since 2014, the system now covers over 200 km of alpine track.
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A vertical 90° barrier installed above a tunnel entrance protects against large rockfall. Due to high-risk access, the system required special safety planning and climbing expertise.
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Deployed in lower-risk areas, these lightweight 2.5 m fences are designed to detect, not absorb, impacts from rock, snow, or trees. One installation spans 400+ meters with over 40 sensors.
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Located where one track runs through a tunnel and another outside, this system monitors a 100-year-old stone wall for movement that could pose a risk to passing trains. Three sensors detect tilt, vibration, and collapse.
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In rugged terrain without infrastructure, systems rely on solar power and wireless relays to transmit sensor data up to 2.5 km. Redundancy ensures coverage across forest, cliff, and valley zones.
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Installed in 2024 following a major debris flow, this dual-system monitors the Hübschhorn rock glacier for long-term movement and provides real-time alerts for sudden events like rockfalls. A targeted sensor is mounted on a large unstable boulder above the Engi snow shed to detect potential collapse.
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