S&DJR 6 wheeled passenger brake van

Model Railways published drawings of this and similar brake vans in an article by P.R.Bunce and P.M.Giles in its issue of December 1979.
Looking closely at the original print, it seems likely that the paintwork was well weathered and the lining had dulled down, so as to be inconspicuous against the more obvious light and shade of the panelling.