Introduced in 1950, almost 14,000 of these mineral wagons were built for BR. Two basic designs were used, both having twin side doors and one end door in their 21ft 6in long bodies, mounted on 12ft wheelbase under-frames. The 21ton wagons (MDO and MDV) were closer to their 16 ton predecessors  in height, and lasted longest both in production and in service. The South Wales coalfields were the types main area of operation and the last were withdrawn in about 1992. These wagons ran in block rakes, and mixed with 16t Minerals (MCO) 21t Hoppers (HTO) and 24.5t Hoppers (HUO).

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