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Possibly the classic British Railways wagon. No model layout from this period can be without one. This is in HO scale, a rarity for British HO modelling. Just needs wheels(might need to drill out axle boxes a bit). Add your own couplings of choice.
This is only one type, there were many variations, all on 9ft wheelbase, so these are possible models.
Hopefully first of a series of wagons for British HO.