London fog, source of endless inspiration to cinema scriptwriters, is just a headache to season-ticket-holders (British for commuters). On the 20 to 40 days each winter when visibility falls below 200 yards, the Reading, Chelmsford and Maidstone trains creep along at 30 m.p.h., often wait 20 minutes at junctions, reach London as much as two hours late. Last week British railway technicians were hard at work trying to do something about fog-foundered trains. They had two novel gadgets, both still in the experimental stage, which might make it possible for trains to keep...
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