This weekend I went through my old locos from 30 plus years ago to sort out what could be got moving and what could be scrapped / kept for parts. I got 2 old 0-6-0 tank engines running again, an LNER and a GWR Pannier. The GWR runs so smoothly you can hardly hear it, and can crawl at an amazingly slow pace. I placed it on the layout, and watched it negotiate ‘Y’ points and medium radius turnouts (all electrofrog). However, when it came to a double slip, large radius curved or express turnout, it stalled / jumped/derailed as the gap between the check rail and the outer rail appears too small. I installed a temporary fiddle yard for my branch line last week, and have used some old Peco setrack Insulfrog points – given the line from the branch to the main station is comprised of ‘Y’ and medium radius electrofrog turnouts, it means the GWR Pannier can be used – much to my relief. Now I’m aware of the thickness of the wheel flange and the back to back measurement perhaps not as accurate as they need to be for modern electrofrog point work, but why does it work on the ‘Y’’ and medium electrofrog turnouts, but not on the others? It suggests a small difference in the turnout manufacture. Any ideas? Befuddled of Setforth.