Ruling gradient

The term `ruling grade` is usually used as a synonym for `steepest climb` between two points on a railroad, but if the steepest climb is, say, a quarter-mile of 1% preceded and followed by 0.5% the `ruling grade` can only be defined arbitrarily. In the 1953 edition of Railway Engineering Hay says `The ruling grade may be defined as the maxi...
Found on http://en.wikipedia.org/wiki/Ruling_gradient
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