Hi Melanie and a (belated) welcome to the Forum. Fair question - and I believe in such a catastrophic scenario the trains would stop as well as almost everything else in the country! I dare say "they" have some contingency plans for such a situation but normal mortals like us are unlikely to learn about them.
On the subject, I read a fascinating account years ago about government plans drawn up during the Cold War (so perhaps 1960s/1970s) about what to do if a nuclear attack was expected to wipe out most life in the country. One train was planned to take selected top officials to a bunker which, if I remember correctly, was accessed off a line inside somewhere like Box Tunnel. I was sure I'd seen a book on this appropriately entitled The Last Train but I'm blowed if I can find a reference to this anywhere now.
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