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The issue with road traffic in such a tunnel (or also on such a bridge) is the emergency procedure. If there's an accident on the end cars turn around wild and

The issue with road traffic in such a tunnel (or also on such a bridge) is the emergency procedure. If there's an accident on the end cars turn around wild and block the passage etc. The trains are operated with an engine and driver on each end. In case of emergency the rear can take over immediately and return to the other end of the tunnel.

lorenzhs 9y ago
Very true. However, a train on fire usually can’t turn around, but there are several emergency stations in the tunnel with emergency evacuation for people (via the service tunnel) and automated high-pressure water droplet extinguishing systems. This was installed in response to a fire in 2008 iirc. It facilitated rescue and fire fighting (because the exact position of the fire is known) and the automated system also helps minimise damage to the tunnel infrastructure.