"there are no 2rail switches made that will work with 3rail wheels"
I doubt many folks would want to run 3 rail wheels on 2 rail track as they are not insulated so fixing them would be harder than swapping them for 2 rail wheels. It is possible though to run big flanges on 2 rail trains, N scale guys do it all the time. I built some turnouts for my TT scale trains that can take both small and large flanges, the secret is to leave off the guard rails (or install them as dummies far from the back of scale wheels) the large flanged wheels have a narrower back to back dimension than the scale wheels. On a properly constructed turnout guard rails are not needed for reliable operation in most locations.....DaveB
