I thought it would be easier to ask than look it up in a different thread. Does anybody have any radius suggestions for an SD45T-2. Well the long loco is not the problem but the taconite cars I have. They take turns Ok and stay coupled but not to the loco. I bought new long shank couplers but I have not used them because I have not started laying track on the new layout. But I want to resolve issues before they arise. I have large enough flex track curves but I need tighter curves in one area, I have about 4' 4" for a half circle turn. What is a good radius? Possibly largest able to fit?