Ballast and Subgrade Requirements Study : Railroad Track Substructure-Materials Evaluation and Stabilization Practices

PDFTech ReportDOT-TSC-FRA-82-3FRA/ORD-83/04.1DOT-TSC-1527RR119/R1320Ballast (Railroads)SubballastRailroad tracksSubgrade (Pavements)Soil stabilizationDrainageDesignField testsPerformanceUnited StatesUnited States. Federal Railroad AdministrationSimon, R. M.Edgers, L.Errico, J. V.Goldberg-Zoino & AssociatesJohn A. Volpe National Transportation Systems Center (U.S.)United States. Federal Railroad Administration. Office of Research and DevelopmentAGR-INFRASTRUCTURE-RailroadsNTL-RAIL TRANSPORTATION-RAIL TRANSPORTATIONVolpe National Transportation Systems Center, Technical Reference CenterEarth materials--i.e., soil and rock--form the substructure of all railroad track. In this report, the functions and performance characteristics of each of the substructure elements (i.e., ballast, subballast, and subgrade), and the material properties that influence the substructure performance are described. In addition, guidelines are provided for their use in railroad track