Why aren't there monorails in numerous American cities? Wayne Curtis explored that question by visiting Las Vegas in 2005, shortly after Sin City opened its single-track effort at mass transit -- a project he gave mixed reviews. "Those of us who came of age making pilgrimages to Disney's Tomorrowland know that monorails produce a complicated nostalgia for the future," he wrote, concluding that "the monorail was twenty years ahead of its time, and it has been mired there ever since."

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