I have a GNR full brake to build in 7mm so I'll find out! I have to say that the 4mm kits were an absolute joy. And I also have the crane, but that needs a bit of thinking about. (I've only had it in the unbuilt kits for getting on for ten years.....) Brian This is a detail shot of the bogie brake. The roof is a bit dodgy, but bearing in mind this is 4mm the level of detail is superb.