Imperial measure
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Imperial Measure was a former system of measurement used in some Commonwealth nations, most notably the United Kingdom and Canada. The Imperial system of measurement was formalised in England on January 1, 1826 and in so doing invalidated the well-known proverb "a pint's a pound the world around", which was true for the older pint but not for the new Imperial pint. Imperial measures have since been supplanted by the introduction of the Metric (SI) system, although Canadian railways continue to use Imperial.
One Imperial gallon equals 1.20094 US gallons
One US gallon equals .833 Imperial gallons
One Imperial gallon of water weighs 10 pounds
One Imperial gallon equals 4.5 litres
One ton is 2000 pounds
One long ton is 2240 pounds. Rail and coal was measured by the long ton. Even retail sales of coal to households in the 1950s was by the long ton.
Reference
6 George IV chap.12 1825 (statute)