Smokie, Two things. I too love that engine, the Lionel NKP Berk #779, and own one. I use 3R Atlas track, and I could not keep it on the rails with anything less than 054. Let me define "keep it on the rails": While the engine stays upright, the drive wheels, that is, at least the four inside drivers, cannot tolerate the sharp 042 curve radius, and slides a bit side-wise off the rails, giving the engine minimal traction. BTW, whereabouts in TN? I have a place in Unicoi, just outside of Erwin, the home of the Clinchfield. More correctly, thanx to the CSX, it was the home of the Clinchfield.
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