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I have a 4-8-2. when they say 18" min radius, it really is. 17 and 7/8" won't work. I have a 4x8 layout and when I first put the 4-8-2 on the track and ran it I found all the curves that I thought were 18" .Had to realign my track so I could run my new loco. Bottom line is 18" works OK but broader curves are better. As far as turnouts go I use Peco small radius and have no problems with them.
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