38-274 BR 22T CPV Presflo Bulk Powder Wagon BR Bauxite 'Tunnel Cement' No.B887990 - WeatheredWhen British Railways was formed in 1948, it inherited thousands of wagons from the big four. Whilst many of these wagons were perfectly suited for their intended purposes, BR identified a need for a purpose built wagon to transport powered goods, such as cement, which previously were transported in bags in vans. So, in 1954 the first Presflo (short for pressure flow) was built, which utilised the science of air fluidisation, a process which pumps air