Abstract:The history of the use of railroad ballast is traced in skeleton form, primarily to indicate the reasons for the development of ballast as used today. The functions served by ballast in spreading the load, in decreasing impact stresses, and in draining water away from under the ties are described. Also, the destructive forces, both those of nature and those incident to the use of ballast, are discussed, for these must be resisted and they influence the minimum quality of aggregates which are suitable for use u… Show more
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