38-262 BR 20T Presflo Bulk Powder Wagon 'ICI Bulk Salt' Blue No.B888554When 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