Quotation from: General Science

Written by: Bertha M. Clark


If, on the other hand, the ascent had been gradual, so that the grade
was 66 feet per mile, a pull from the engine of one eightieth of the
combined weight would have sufficed to land the train of cars at the
crest of the grade.


Because of these facts, engineers spend great sums in grading down
railroad beds, making them as nearly level as possible. In mountainous
regions, the topography of the land prevents the elimination of all
steep grades, but nevertheless the attempt is always made to follow
the easiest grades.

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