U and V-class destroyer, a class of destroyers of the Royal Navy launched in 1942–1943
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British U-class submarine, a class of 49 submarines built just before and during World War II
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SR U class, 2-6-0 steam locomotives built for the Southern Railway
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ORP Dzik, a British U-class submarine transferred to the Polish Navy and serving between 1942 and 1946
ORP Dzik (Boar) was a U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.
British V-class submarine, officially "U-Class Long hull 1941–42 program," a class of British submarines built during World War II