The economics of railroad construction by Webb Walter Loring 1863-1941

Author:Webb, Walter Loring, 1863-1941. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Railroads
Publisher: New York : J. Wiley & sons;
Published: 1912-03-25T05:00:00+00:00

170 THE ECONOMICS OF RAILROAD CONSTRUCTION.

The average of the five values in each case is given in

column 7. The significance of these numbers in column

7 may be interpreted as follows: .150, for example,

means that the excess wear per degree of curve on the

150 various rails of the 4° 31' curve averaged -^-— of the wear

on an average tangent. The other figures in the last column are to be interpreted similarly. The 4° 31' curve was on a 0.525% grade, the 5° curve was on a 0.3% grade, the 10° curve was on a 0.128% grade, and the 10° 30' curve was on a 0.3% grade. The rate of grade on these curves evidently does not account for the variations in these values. It is quite apparent that the rail wear per degree of curve for the sharper curves does not increase with the curvature, and it is more than likely that it diminishes, as was indicated by the diagrams given in § 100. A similar computation was made from the results of the wear on a 3° curve on the Minnesota division. See Table XIX.

Table XIX.-

-Rail Wear on Curves — Northern Pacific Railroad Minnesota Division.

Here the average excess per degree amounted to 31% of the rail wear on the tangent. The average percentage of excess per degree on the curves of the Pacific division

was 20.

f Oi

for the one curve on the Minnesota division

it was 31%; allowing the average for the four curves a weight of four and giving a weight of one for the curve

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