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science · 1883
Before 1883, a train traveler crossing the country could reset a pocket watch dozens of times, because every city kept its own solar noon. The railroads fixed it in a single afternoon, with no law behind them at all.
Facts drawn from the Library of Congress, the National Institute of Standards and Technology, and Encyclopaedia Britannica; interpretive framing is labeled as modeled analysis.
Before 1883, American cities and towns each set their clocks to local solar noon, so a train timetable had to account for dozens of slightly different local times along a single route. Railroads sometimes ran on the home-city time of their headquarters, which created scheduling confusion and real safety hazards on shared track.
[VERIFIED] On November 18, 1883, remembered as the day of two noons, American and Canadian railroads adopted a system of four standard time zones designed by railway engineer William F. Allen for the General Time Convention, resetting clocks across the continent within a single afternoon.