2,150 of this design were built in 1953 - 1956. They were used to carry coal to large industrial users such as steel works and power stations as certain of BRs own engine sheds. At first they were designated as the standard mineral wagon but they were too large for most customers. In later years some were used for carrying infill traffic before final withdrawal in 1982.Transfers for 1950s and 1960/70s periods included.