In the 1850s and 1860s British ra ilway companies ensured uniform time at stations by arranging for clock manufacturers to send a man once a week from stati on to station to ensure that the clocks were keeping good time . At every station a porter would be told to have a ladder ready and wait while the clockman ascended, wound the clock, and adjusted the hands . If necessary the train would be kept a minute or two for him so that he could do the journey down the line in one day.

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