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I shouldn't think that there is much in a modern tunnel that would be damaged to any great extent by a fire moving across it. Most serious damage occurs when the structure is exposed to prolonged high temperatures such as when the burning train comes to a halt. I don't know if the Channel Tunnel train drivers have any say in deciding whether or not to stop or if the train is automatically brought to a halt by a safety trip system.
In the new Lötschberg Base Tunnel in Switzerland it is left to the driver to decide where and when to stop based on the information at his disposal.
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