@gunrunnerjohn posted:Correct, you can't truly make those two curves concentric safely. I will guarantee that with 3.6" c-to-c on the curves that you will have problems with anything that has a significant overhang. For instance, on O72 curves, my Vision Line Big Boy hangs out 3" from the track centerline. For reasons I don't fully understand, the MTH Premier Big Boy needs more than that, about 3.25" from the centerline. Either of those would contact even small rolling stock on the outside rail, the overhang would be right up to the inside rail on the outer track!
What do you suggest then? Going to the next step up with gargraves which is 89" or going down to O63?
I have seen many people on this forum say they use O72 and O80 on their layouts- so how are they getting away with it?
