I remeber as a youngster watching the Princes Risborough to Aylesbury DMU towing a single van behind, never found out why.
Ian G
Not an ex-gunpowder van at all. The GWR built "iron" bodied covered wagons for several departments, two examples are tool vans for Pooley (installation and servicing of weighing equipment) and mobile air compressors for the civil engineers. Some of the wagons were four wheel and some were six wheel... a fair number of these wagons were allocated diagrams and hence drawings are available.Any ideas why the steel bodied van on the right (ex gunpowder?) has a window in the end? Some departmental use I guess?