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Hello Dave777:The main consideration on any proposed radius for any scale, is what equipment one wishes to run on that proposed radius. ( For example, short standard gauge HO traction equipment can run on 6" radius.) Do you already have some HOn3 equipment?? What kind? The max. radius for an oval on a 24" wide layout would be down to about 11 1/4", as you have to have a little clearance for overhang.This is too small for most HOn3 equipment, even though it is shorter than standard gauge and has smaller wheels.HOn3 usually means steam locomotives, and anything shorter than an 0-6-0 would be extremely rare. You really need 14"-15" radius as a minimum, to avoid derailment difficulties.HOn3 is light in weight and very unforgiving of any kind of problems. On the other hand, HOn30" would work fine in most cases...this is on N gauge width track.Years ago there was HOe, also 30" gauge, with European mining engines & cars, made by Egger-Bahn, and by Roco. Compliments of the Season & best regards / Mike
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