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Years ago a convoy of Russian soldiers was traveling through a tunnel and rebels blew up the tunnel entrance and exit trapping the soldiers. <br /> <br /> <br />I am not sure about sprinkler systems for tunnels but I have heard the tunnels (some anyway) do have a ventilation system. I read or heard (don't ask me where) that the steam engine crews would use some sort of can with ice in it to help them breathe while going through a tunnel. Maybe someone can add more to this. I have always wondered about the crews in a caboose what they would do in a tunnel since they had no choice but to "follow" the train. I saw a picture a while back of a train waiting to enter a tunnel. You could see some smoke coming from the tunnel entrance. So how long do they have to wait before the next train can enter the tunnel? <br />
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