Tom, I did some more testing with AM wheels. Their flanges do not touch the ties when on code 125 rail, but they do just barely touch the top of the rail base where it meets the web. Were the rails spiked rather than glued the flanges would hit the spikes. The MTH wheels have smaller flanges than the AM wheels and are closer to a scale shape. These would clear spikes on code 125 rail. Based on the size of the gap the MTH wheels might not contact the ties with code 100 rail. I doubt they would clear any spikes.
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