BR built a total of 875 of these Kernow icons across several batches from 1954 up until 1960. The "Clayhoods were built to complement and eventually replace the GWR O.13 clay wagons  Running in short branchline trains all the way up to 50 wagon mega block trains, this staple of Cornish railway scene were withdrawn and replaced by the air braked CDA wagons in 1988.