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- W822686148 abstract "Noise abatement in rail rapid transit is an expensive and complicated undertaking. Cost is minimized by selecting a proper mix of treatments to attain a specified noise objective, or target. Assessments of specific properties and development of an abatement methodology were accomplished in earlier works. In this report the abatement methodology is refined and a number of case studies conducted. This report focuses on changes in the system-wide treatment plan, the program cost, and the net impact due to such factors as: variations in discount rate; changes in abatement target level; introduction of new cars; prohibition of certain treatments, such as resilient wheels and steel el barriers; and specification of certain treatments on a categoric basis. In the course of the studies, it was found that a system average noise level index is rather insensitive to system changes. A measure based upon percent of system exceeding certain noise levels is developed. Programs for in-train abatement were developed for 1976 and 1985 car fleet compositions, and estimated to be comparable in net effect. A program costing in the order of $5.0 million annual cost for in-train abatement was found to have the greatest abatement per unit cost, although additional abatement is achieved with additional money. Effects of changes in the relative importance of different noise sources were studied. Additional studies on in-community abatement are reported herein, as are some ancillary in-train studies." @default.
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- W822686148 date "1978-12-01" @default.
- W822686148 modified "2023-09-27" @default.
- W822686148 title "NOISE ABATEMENT IN RAIL RAPID TRANSIT: EFFECT OF SOME VARIATIONS" @default.
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