Not knowing anything about railways I can’t answer the question, but it did remind me about the “urban myth” that the government had mothballed a fleet of steam locomotives to be used in the event of say a nuclear attack, when no oil or electricity would be available. A programme on Radio 4, called Private Eye or something, where this sort of thing was investigated, I think, came to the conclusion that it was just a myth. The only thing I have learned over the years is that half you see and all you hear may not be true.
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