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I figure there's a simple formula to it, like 'x' number of feet of rise over every 100 feet of run, thus if the track rose 3 feet over the course of a 100 foot section of track, it would be a 3% grade, is that right? What is the correct way to measure grade percentage? Also, in modern railroading terms, what would be considered 'steep' for mainline Class 1 railroads?
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