It now turns out that the Great Western Main Line's "Tunnel of Steel" was not necessary after all. It seems, as Roger Ford explains in "Informed Sources", that there were design errors which went unnoticed.
There have indeed been problems with overhead electrification on the East Coast Main line, which was carried out to super-economical standards, but the West Coast route, electrified in the 1970s, has performed reliably even though it passes through some of the most exposed uplands in the country; in comparison, it looks like gossamer.
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