International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 261
Where the gradesexceed .5 per cent, and the curves 5°, compensation shouldbe made. 1438. Changing of Grade Lines.—Unforeseen diffi-culties sometimes arise during construction which warrantthe changing of grade lines, but these occasions are rare.If the final grade line has been properly considered,… … lines. Let A C and C B, Fig. 375, be two grade linesmeeting at C. These grades are given by the rise per station in going insome particular direction. Thus, starting from A, thegrades A C and C B may be denoted by g and g\ thatis, the grade for any station on A C is found by adding the RAILROAD…
Railroad engineering
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