In railroading, the ruling grade is the steepest grade on the rail line between two locations. Climbing the steepest part of the line dictates the minimum motive power needed, or how light the train must be, in order for the run to be made without assistance.
In railroading, the ruling grade is the steepest grade on the rail line between two locations. Climbing the steepest part of the line dictates the minimum motive power needed, or how light the train must be, in order for the run to be made without assistance.
Source: Wikipedia "Ruling gradient" · CC BY-SA 4.0
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