Great Western Railway

My area of interest is mainly the valley lines leading to Newport.

Could this have been used on the very steep branches from Pontnewynydd before the special brake vans were built? It would suit more than a more modern van and the drawing was annotated "sent to the north" which could have included Pontypool Road.... I have a feeling I should repaint it red but that will have to wait quite some time! Pity I left the safety chain across the coupling hook.