File:Railway maintenance engineering, with notes on construction (1915) (14572215189).jpg

Identifier: railwaymaintenan00sell (find matches)
Title: Railway maintenance engineering, with notes on construction
Year: 1915 (1910s)
Authors: Sellew, William Hamilton, 1875-
Subjects: Railroads Railroads
Publisher: New York, D. Van Nostrand Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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eyond this to the ditchin cuts, and 4 ft. 6 in. to the edge of the bank in fills. A sod fine on the edge of the roadbed protects the grade andprevents erosion, besides presenting a very neat appearance.It is used by such roads as the New York Central, PennsylvaniaLines and Illinois Central, although some engineers object toto it on the ground that it may retain water and prevent freedrainage. The American Railway Engineering Association considersthat the track in excavation is placed upon what is virtually alow embankment, and in order to preserve uniformity of con-ditions immediately under the track throughout the line recom-mends that the width of sub-grade in excavations should bemade the same as on embankments, outside of which sufficientroom should be allowed for side ditches. Where the character of the soil is poor, drains should beprovided of vitrified pipe laid in trenches filled with brokenstone or similar material. These should be laid to a depth of 39 40 RAILWAY MAIXTEXAXCE
Text Appearing After Image:
03O c8 .2! > 1 TO t,te-.>*--•-fi-^r* GRADING 41 at least 3 ft. 6 ins. below the base of rail for ordinary bad mate-rial, and more if necessary, and empty into side ditches lowenough to permit the drains to empty themselves freely. 16. Drainage.—One of the most difficult and importantproblems the maintenance of way engineer has to meet is thequestion of keeping water away from the track. In all cuts sideditches should be built large enough to carry off freely all thesurface water and drainage that can come to them. The sizerequired for these ditches will vary, depending upon the amountof water they will have to take care of, the rate of grade of theditch, the character of the material in which it is dug, etc. It is difficult to give any rule for the size of side ditches.Those shown on the sections of the Pennsylvania Roadbed,Fig. 22, represent the minimum size for average conditions oflengths of cuts, materials, grades, etc., the size to be increasedwhen any of these conditio

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