The 20 ton break van was probably conceived as a consequence of a Board of Trade accident investigation highlighting the lack of braking power for heavy coal trains on the North Staffordshire. The diagram 20 was a logical development of the diagram 11 10 ton van. Indeed several features of the later 10 ton vehicles are evident, including the double side windows, the veranda and of course the outside brake handle. A number of these 20 ton break vans were built by several builders including Cravens in 1908. It is possible that a number were also built at Stoke.