The PVB is a type of rail van introduced in the mid 1980s in limited numbers. While variations existed the main build of the wagon remained the same, a curtain sided private owner wagon with air or vacuum brakes. Being that the vans were curtain sided similar to a road transport trailer, they often carried the liveries of the company that they worked for. Wagons would have a working capacity of around 31 tonnes. Much of the fleet would be purchased by the Ministry of Defence when they fell out of use as a domestic freight wagon.