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An Atherns GP 38-2, f7, sw1500, or GP9 will not run on 15" or 18" radius reliably without derailing. Neither will a Walthers dash 8 -40b. These are great locos, they just will not turn that tight in real life, The frount wheels come out always to the outside. Any car over 40" will also have trouble. My remaining 18" radius turns are off limits to all traffic anymore. I would pull them but they are part of my original layout and it's sacred. I advise again't tight turns and wish someone had warned me when I first started. 22" is almost too tight, 80+foot cars will not run on them.
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