the difference is clearly stated in the first post - 40 inch diameter vs 36 inch dieamter. 36 inch diameter is 4 inches smaller - a little more than the width of your hand. A locomotive that can go around a 40 inch diameter may not be able go around a 4 inch smaller diameter 35 inch curve. They are not the same! 40 inches is not the same as 36 - at least with my rulers!
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