A unit of weight equal to 2,240 pounds (about 1,016 kg), used mainly in the UK and Commonwealth countries. Contrast with ショートトン (short ton, 2,000 lbs) and メトリックトン (metric ton, 1,000 kg).
This ship has a cargo capacity of 50,000 long tons.
Variant with an interpunct, sometimes used for clarity.
Borrowed from English 'long ton'.