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- W592795846 abstract "Since the early 1980s in the United States, CSX Transportation (and its predecessor lines), the other three large Class I railroads, and numerous smaller railroads have been actively involved in utilizing hot mix asphalt (HMA) underlayment during track structure rehabilitation of literally thousands of special trackworks. Typically, special trackworks are more capital intensive to purchase, install, and maintain and the documented life expectancies are many times only a fraction of that obtained on equivalent lengths of open track sections. It is often difficult to obtain and maintain adequate drainage in the vicinity of special trackworks. The added impacts stemming from track geometric deviations, rail irregularities, and vertical track stiffness variations tend to shorten their service lives. The majority of the special trackworks underlain with HMA underlayment had previously required abnormally intensive maintenance at the specific locations to continuously maintain conformance to the specified track geometric parameters for the particular class of track. These maintenance expenses not only strain engineering budgets, but also have a negative impact on operating efficiencies on the major line haul routes. Documented cost savings from numerous installation sites indicate the minimal increase in initial costs to install HMA underlayments is often recovered in less than a year. Numerous types of special trackwork installations are described. These include tunnel floors / approaches, bridge approaches, railroad crossing diamonds, crossovers, and switch turnouts, and rail/highway at-grade crossings. Significant details are provided relative to the unique conditions and situations associated with each type of special trackwork. Brief descriptions are presented for representative projects. For the covering abstract see ITRD E123761." @default.
- W592795846 created "2016-06-24" @default.
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- W592795846 date "2003-01-01" @default.
- W592795846 modified "2023-09-27" @default.
- W592795846 title "APPLICATIONS AND LONG-TERM PERFORMANCES OF ASPHALT UNDERLAYMENT TRACKBEDS AT SPECIAL TRACKWORKS" @default.
- W592795846 hasPublicationYear "2003" @default.
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