Ok im noob at this hobby here and i need help. In my layout i want to run a SD40 or a SD40-2 by athearn or bachmann. My question is what is the min radius i can run with these loco's. All my layouts ive done using RTS 7.0 have 18" ers. Do i need to do another one that has a 22" radius? If it helps the layout size it goin to be 4x10. If by some god alfull reason i cant do 22" ill stick to my orginal plan and get a few GP35's.
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