What is cwt?

Some articles on cwt:

RML 64 Pounder 64 Cwt Gun - See Also
... RML 64 pounder 58 cwt gun conversion of SBML 32 pounder 58 cwt gun RML 64 pounder 71 cwt gun conversion of SBML 8 inch 65 cwt gun ...
Midland Railway Johnson 0-6-0 - Dimensions - Later Dimensions
160 psi 4′ 10½″ 18″ × 26″ 19420 lbf 3F 43 tons 17 cwt 175 psi 4′ 10½″ 18″ × 26″ 21240 lbf 3190–3774 2F 40 tons 160 psi 5′ 2½″ 18″ × 26″ 18185 lbf 3F 43 tons 17 ...

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