Connecting the emergency stops with the access tunnels and from these to the outside area allows fresh air intake and the generation of positive air pressure inside the tunnel, thus preventing smoke from spreading through the entire tunnel system. This ensures that there is always fresh air in the cross-tunnels and at the emergency stops. The order of rescue measures in the tunnel in case of an accident 1. Emergency stop: In case of an accident the train tries to exit the tunnel or stops at one emergency station. 3. Evacuation of the train: Passengers leave the train and proceed to the escape doors. These lead directly to the central tunnel through the connecting tunnels. 4. Evacuation from the tunnel: Passengers wait in the safe central tunnel for the rescue train and board on arrival. An alternative rescue route is directly via the access tunnel. 2. Smoke extraction: Using fresh air, the tunnel ventilation system generates overpressure in the central tunnel and in all connecting tunnels, which keeps all escape routes free of smoke. Detailed view of connecting tunnel and exhaust extraction cross-tunnel West tunnel Central tunnel Connecting tunnels Escape door Exhaust extraction cross-tunnel Sub-ceiling Exhaust extraction damper Escape door Exploratory tunnel East tunnel 22 BRENNER BASE TUNNEL
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