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ruling grade
noun
, Railroads.
- the steepest grade on a given stretch of track, which determines the maximum tonnage that can be hauled in a train having a given horsepower at a stated minimum speed.
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Example Sentences
There was only one choice of locations: the valley line, where the ruling grade is about nominal.
From Project Gutenberg
In other words, what is known as the "ruling grade" is a function, strictly speaking, of the length as well as the rate of grade.
From Project Gutenberg
In the tunnels east of the Terminal Station the ruling grade is 1.5% for both east-bound and west-bound traffic.
From Project Gutenberg
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