Before the railways, every town in Britain kept its own local time. Noon arrived when the s stood hig above ea particular to, so clo in t west lag a f minutes beh clocks in the east. The difference hardly mattered to a messenger travelling on horseback, but it became dangerous once trains shared a single track. A printed timetable was useless if two stations disagreed about the hour. Railway companies therefore imposed one uniform standard, and the country gradually accepted it.

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