This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...on the roadbed through the sub-ballast. It should be observed that these tests were made with dry sand and that probably a very great difference in distributing power would be found for different degrees of dampness. The American Railway Engineering Association recommends the following for the proper depth of ballast, ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...on the roadbed through the sub-ballast. It should be observed that these tests were made with dry sand and that probably a very great difference in distributing power would be found for different degrees of dampness. The American Railway Engineering Association recommends the following for the proper depth of ballast, f From the data available, it is concluded that with ties 7 in. by 9 in. by 85 ft., spaced approximately 24 in. to 25.5 in., center to center, a depth Engineering Record, May 30, 1914, p. 608. t Supplement to Manual, 1912, p. 7. Eccentricity of Load in Inches. Eccentricity of Load in Inches. A B of 24 in. of stone ballast is necessary to produce uniform pressure on the subgrade, and a combination of a lower layer of gravel or cinder ballast (18 in. to 24 in.) and an upper layer of stone ballast (6 in. to 10 in.) approximately 24 in. deep in the aggregate, with the same spacing of the ties, will produce nearly the same results. The depth of the ballast refers to the distance from the bottom of the tie to the top of the subgrade. BIBLIOGRAPHY Kinds Of Report of Committee on Ballasting, Proceedings, Am. Ry. Eng. and M. of W. Assn., Vol. 10, Part 1, 1909, pp. 690-700 (contains descriptions of gravel-washing plant and of burning clay for ballast). Ballast, by G. W. Vaughan, ibid., Vol. 13, 1912, pp. 290-300 (contains photographs of different kinds of ballast). Railway Track and Track Work, E. E. Russell Tratman, 1909, New York, pp. 26-31. (Descriptions of different kinds of ballast, p. 520, Table IV. gives kinds of ballast used on 59 different roads.) Sections Ballast Sections, Manual, Am. Ry. Eng. Assn., 1911, pp. 49, 50. Ballast Sections, Proceedings Am. Ry. Eng. Assn. Vol. 16, 1915, pp. 1010-1013. Maintenance of Way Standards on American Railway...
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