Charles Roberts built 1,000 22 ton hopper wagons to Diagram 161 in 1949, and a year later 1,500 were built to Diagram 1/162 uprated to 24 tons. These were built by Charles Roberts, and Cambrian with Birmingham upgrading 500 of the 22 ton 1/161 wagons. They were initially used for iron ore traffic and latterly Limestone, chalk and sand.