United States Department of Transportation
i
Mixed Freight and Higher-Speed Passenger Trains: Framework for Superelevation Design
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2019-10-01
[PDF-2.41 MB]
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Edition:Technical Report September 2015 – May 2016
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Abstract:As the demand for higher-speed passenger trains increases, the disparity between freight and passenger operations also increases. On mixed-use rail corridors, the result is a bi-modal distribution of train speeds that complicates design of curve superelevation. To aid in making informed curve superelevation decisions on mixed-use rail corridors, this report synthesizes industry knowledge and tools used to evaluate curve superelevation. This report develops the superelevation bandwidth concept into a framework to optimize superelevation on mixed-use corridors. The framework is presented as both a graphical approach and a mathematical model that can be applied to select superelevation design parameters for multiple curves on a rail corridor. Five case studies illustrating typical design situations encountered in the development of mixed-use corridors are highlighted. Each case study demonstrates how the selection of actual superelevation results in trade-offs between the operation of slower trains with overbalance and imposing curve speed restrictions on faster trains.
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