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I'm assuming the train is moving from left to right on the drawing.
I can't determine how the flange of the wheel on the rail B-B ever comes up and over B-B on to K-H'. Obviously the other wheel flange will go on to G-H, and I get it that the wheels both rise 1-3/4"--once they are on the divergent rails--but how does the flange on the B-B rail ever move over? Can it be brute force? Wouldn't that put a lot of wear on the flanges and the gauge-side of rail right there where the flanges are riding up?