Spacing and Length of Passing Sidings and the Incremental Capacity of Single Track
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Spacing and Length of Passing Sidings and the Incremental Capacity of Single Track

Filetype[PDF-56.74 KB]


English
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  • Alternative Title:
    Spacing and Length of Passing Sidings and the Incremental Capacity of Single Track : technical summary.
  • Creators:
  • Corporate Creators:
    National University Rail Center (U.S.)
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    National University Rail Center (U.S.)
  • Abstract:
    The objective of this study is to evaluate the effect of initial siding spacing and distribution of siding length on the incremental capacity of infrastructure investments on single-track railway lines. Previous research has shown a linear reduction in train delay as sections of a single-track line with uniform initial siding spacing and length are converted to double track. This first phase of this project will determine if this same relationship is observed on lines with different initial uniform siding spacing. Both homogenous heterogeneous traffic mixtures will be considered. The second phase of this project will examine single-track lines that exhibit a more realistic non-uniform distribution of siding spacing. The study of non-uniform siding spacing will determine if the linear trend observed previously can be used to infer the incremental capacity of investment in double-track siding connections of different lengths. The third phase of this research will investigate the relationship between siding length, train length and capacity of single-track lines. Technology such as distributed power has allowed railways to seek greater efficiency through operation of longer trains. On most single-track lines, feasible train lengths exceed the length of many passing sidings. Introducing these longer trains on lines with many short sidings complicates meet-and-pass train dispatching decisions. An insufficient number of long sidings may result in increased delay. This additional delay may offset the benefits of reduced train count obtained by running fewer longer trains, decreasing the overall throughput and productivity of the line. This project will investigate the relationship between the proportion of long sidings on a route and the number of long trains it can support (as a fraction of total traffic) for a given level of service.
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