The pull of one of the small levers, which protruded like bookmarks from the shelves, threw thousands of electric circuits into motion, made thousands of contacts and broke as many others, set dozens of switches to clear a chosen course and dozens of signals to light it, with no error left possible, no chance, no contradiction—an enormous complexity of thought condensed into one movement of a human hand to set and insure the course of a train, that hundreds of trains might safely rush by, that thousands of tons of metal and lives might pass in speeding streaks, a breath away from one another,
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