A new deatiled model of the Metalair design pressure discharge bulk powder tank wagons used principally for bulk cement traffic. The developing technologies for pressure discharge systems and lining of wagons with materials promoting the clearing of the load allowed the design of self-clearing bulk powder wagons to be simplified. These cylindrical tanks replaced the BR Presflo covered hoppers and chevron style tank wagons in cement service.
This model is painted in a plain grey scheme, a colour which helped disguise cement spillages. Many of these wagons were owned by leasing companies, so were given a plain livery so that a change of leasor would not require extensive repainting.
Era 8 - 9