The book Proceedings of the Annual Convention 90 (1989) was written by author American Railway Engineering Association Here you can read free online of Proceedings of the Annual Convention 90 (1989) book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Proceedings of the Annual Convention 90 (1989) a good or bad book?
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The heat-treated, pre-curved wing rail, and one-piece manga- nese steel casting — consisting of base, point, guard rail, and rail braces — insures a constant guage. (Photo indicates the heavy wheel tread that is main- tained regardless of rail expan- sion or contraction.) C«nley For eompMe deiasla writ*: Conley Frog and S wltoli CO. Box 9188 / Memphia, Teiuieasee 38109 188 Bulletin 721 — American Railway Engineering Association Site Plan Figure 5 In order to investigate subsurface conditions, t...hree exploration holes were advanced with a portable Mobile drill. Figure 6 illustrates the variation in rock quality with depth based on evaluations of the Rock Quality Designation (RQD) index and the core recovery index in the three boreholes. Based on these indices, the engineering quality of the rock mass generally rated as poor to fair with local zones classified as very poor. Based on the core drilling, the overall rock quality appeared to improve below the highly weathered surficial zone which is about 10 feet thick.
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