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Have just watched the "Video 125" production of the TGV cab ride from Marseilles to Paris. The commentary made mention of the trains running at a 4 minute headway. Now, roughly calculating, they 'do' about 3 miles a minute, so at the above headway, that's something like 12 miles. That's a big gap between trains. Wouldn't a 2 minute headway (6 miles approx.) be perfectly safe? Even at the speeds the TGV's do, surely they can stop well within 6 miles.
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