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

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.