@Will A/F also produced Hudsons, Hiawatha's, City of Denvers & Burlington's starting about 1936 until about 1939. Some of these sets in 1936 ran on 40" 4 rail track where the 4th rail was centered between the normal 3 rail's middle and outer rail. That 4th rail was what energized the whistle. I know the Hudson will derail on 031 curves but haven't tried any of the others.
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