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Hi, Gerald, I go along with Ed on this one #6 or larger on the mainlines and #4 in yards or branchlines. As far as turnouts having radi that match various curves I don't think there are any exact matches. The Atlas "Snap Switch" is an 18" radius curve to match their sectional track but as far as I know that's it. Use flex track to build your layout that way you don't have to limit yourself to any fixed radi and you can transition your track to fit smoothly to your turnouts on their diverging side. Unless you use a curved turnout a turnout in a curve is not a good idea. Check out the Shinahora and Peco and Model Engineering line of turnouts all are execellent...Hope this helped...Vic
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