Railway box container or similar

[Lord B of Crafton]

Im looking for either a 10ft or 20ft wooden rail container. Its the type with the 4 lifting straps and doors either in the side or one end. Alternatively any interesting old box or pantecnican body to go as a load on a preserved vehicle. Not too bothered about condition but would prefer somthing relatively solid and located in the south east, central England or midlands.

Cheers

Dave