Vacuum-braked 21 ton coal wagon being loaded from a hopper at Blaenant Colliery, bound for Aberthaw Power Station, c.October 1965 The basic wagon had numerous variants. On creation of British Railways (BR) in 1948 - which took control of all railway assets, including all private owner wagons - the new organisation inherited 55,000 original MoT wagons, they were all given a "B" prefix in their