yeah, but…
Some 25 years back, when I (re-)started in 0 gauge, I had no chance of a layout on which I could get any real running, so I was dependent on a couple of mates who had garden lines (and the Folkestone club’s 7mm section which also had two layouts) all of which were 32mm to G0G-F standards.
so, build stock to S7 and run rarely, or build to G0G-F, and use the stock I’d built? (And socialise with local mates)
And when building track, build to 32 or 31.5?
not so difficult a question!
Simon and others
Coming from a track builders perspective with mainly 4mm scale experience, a couple of years back we had similar discussions re 00 gauge and 00SF. Given firstly many new RTR models are built to finer standards plus the up take of kit building using finer scale wheels (Gibson's) many were noticing erratic movements through RTR and kit built turnouts and crossings, plus modelers wanted a finer scale appearance through crossings..
One solution was to narrow the gap between the wing and check rails (00GA fine), which gave a more scale appearance but required a wider back to back setting. An easier solution was to both go for finer wing and check rail gaps and narrow the track gauge to 16.2mm. Resulting in a better looking and running crossing, but at the cost of narrowing the gauge even more
From what I see moving into 7mm scale a similar situation sits with GOG fine and 0MF. Firstly the difference between GOGf and Scale 7 on the face of it is only 1mm, nowhere near as bad as between 00 and P4, but as with 00 gauge O gauge was designed at a time for use with coarser scale wheels than we have now either in RTR of kits. The same issue of overscale flange width persists in 7mm as 4mm scales, and the less smooth running through crossings. 0MF like 00SF is designed to both visually to look better and improve running, but allows the use of RTR wheels without re-gauging. Again all be it reduces the gauge even further, though in 7mm scale the difference between 0 and scale 7 is much less that 00 & P4
One thing to be aware about 00SF & 0MF is on smaller radius turnouts and crossings, gauge widening might be needed and of with kit built locos introducing a small amount of side play with the drivers. You might even have to gauge widen at places
Standing back as a track builder and looking at ready to run turnouts is the un-prototypical design of RTR trackwork, I understand the reasons why, as far as commercial trackwork construction is concerned, but it looks wrong !!! Especially Set Track with over short check rails and short over bent check rail flanges
I totally accept for those who rely on RTR that they cannot easily convert to Scale 7, but they could convert to using better looking turnouts.
In the past (and it still does) Templot provides 2D plans of prototypically looking trackwork, until now not everyone has the skills or time to build said trackwork , with soaring track kit prices you could even add affordability of track kits, as a reason, though RTR turnouts are nearly as dear
Plans are afoot to make available plans/files for easy to build trackwork at affordable prices, turnouts initially, but not only to a very much wider range of sizes, but radii as well, all to a prototypical design. Easy to build and its just as easy to make with a gauge of 31.5mm or 33mm gauge as it is in 32mm gauge
As you can see, in my opinion before you worry about flangeway gaps, take a look at the actual total visual appearance, before worrying about the odd 0.5mm. With a little thought and effort a much better visual appearance can be achieved. I do like to see stock running smoothly through crossings, but before you get down to altering flangeway gaps, please sort out the much larger abnormalities first, if you do that you may not even feel the need to worry about the odd half a mm
John