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and Part II
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With the proper gear ratio, wheel profile, and proper test track conditions -- the latter two a pair of very big questions -- it might safely be run up to 100 mph. SD40-2s were factory certified for a maximum speed of 65 to 82 mph, depending on gear ratio -- but for 82 mph, you'd need the right track and a good wheel profile to do that every day. E9s with 52:25 gearing were factory certified for a maximum speed of 117 mph. <br /> <br />Most railroads will be setting a maximum speed for an SD70M at 70 mph, and the overspeed will trip a few mph above that speed, say 72-73 mph. <br /> <br />OS
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