noun
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).
この船は積載量が5万ロングトンだ。
This ship has a cargo capacity of 50,000 long tons.