Rail, particularly high-speed rail, could replace many airline flights across the country.
London to Paris is quicker by train (2hours) than plane already -
same goes for most cities in europe less than 500mi apart.
By the time you have spent an hour getting out to the airport, an hour or two at checkin, an hour flying and an hour getting into the city center at the other end - a 190mph train is pretty efficient.
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