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So I did a quick test. It appears that the flange dragging on the rail is the source. If I take the wheel set and turn it to an appropriate angle, such that if you were to draw a line through the axle to the center of the circle of track, it would be straight, the noise goes away. Of course, it's only gone until the wheel set angle reduces so that the flange drags on the side of the rail. It's really not worth re-engineering, just the nature of the tight radius I suspect. I think the simple solution will be to expand the layout from a circle around the tree to one that takes up more of the family room. And valid point about real cars going around turns squealing. More authentic, I suppose. Not necessarily neat under the tree, but it is what it is. Now to source enough track to make a sizeable loop around the family room...
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