At the time, Liverpool and Manchester were proper cities, and while smaller towns, the railway that opened five years before this one that connected Stockton and Darlington clearly operated a similar model of moving goods and passengers.
That's how the date is determined, it's the third Sunday of Lent, "mothering sunday". Hence why the date changes every year (as the dates of Lent move because Easter Sunday is the first Sunday after the first full moon after the Equinox).
~20 years ago for me... I remember finding it when I first started working as a sysadmin. That and the story of the first "bug" report. That was a fun time.
At least my past self was good enough to bag and label.
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