Weeelllll......there in lies the thing. Originally I was building the stock for a 18" gauger railway, thus it is all a bit wide for a typical Haywood inspired estate railway.
Most of the wagons are just shy of 3cm wide. Which, of course, in 7mm equals about 4ft. I would have followed the rule
of 3*track gauge, thus for a 15" railway the max ought to be 3ft 9inches. So we are about 3 or 4 inches over. But at 7mm scale that's only a couple of mm, thus hopefully I won't be too heavily castigated for my indiscretion