None of our customers had mentioned laying transition curves although I think many of them were more collecting these models as opposed to building On3 layouts.
I’m sure a transition curve would help siginificantly with easing these engines into a tighter radius, the question is how tight will they go before derailing. My instincts tell me the driver wheelbase will be the limiting factor with the K class engines. I’d suggest experimenting with some flex track and tacking it down to see what they can do. One of the O gauge 3 rail topics had some good recommendations about using a piece of wood lath and pinning it down to lay out the geometry for a transition curve.
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