North American Joint Positive Train Control System Four-Quadrant Gate Reliability Assessment [Research Results]
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North American Joint Positive Train Control System Four-Quadrant Gate Reliability Assessment [Research Results]

Filetype[PDF-134.23 KB]


  • English
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    • Corporate Creators:
      United States. Department of Transportation. Federal Railroad Administration
    • Subject/TRT Terms:
    • Publication/ Report Number:
      RR08-10
    • Resource Type:
      Brief
    • Geographical Coverage:
      North America
    • Corporate Publisher:
      United States. Department of Transportation. Federal Railroad Administration
    • Abstract:
      The implementation of high-speed rail (HSR) technology, at speeds of 80 to 110 miles per hour (mph) on corridors with pre-existing conventional rail service (up to 80 mph), requires upgrading the crossing activation technology with additional emphasis on safety by adding four-quadrant gates. Frequently, these crossings cannot be closed or grade-separated, and they are equipped with insufficient warning devices to support HSR operations. One solution, four-quadrant gates with inductive loop vehicle detection, was installed at 69 grade crossings on a 120.7-mile segment of the future 280-mile HSR corridor between Chicago and St. Louis. This segment will carry passenger trains at speeds up to 110 mph, including at many of the highway-rail grade crossings. These and other infrastructure improvements were completed to reduce the Chicago to St. Louis travel time from 5.5 hours to 3.5 hours and increase the number of daily round trips in each direction from three to five. The project conducted a reliability analysis of the four-quadrant gate/vehicle detection equipment based on maintenance records obtained from the Union Pacific Railroad, the owner and operator of the grade crossings. The results of this analysis were used to assess the impact of the equipment reliability on the proposed HSR timetable. The study showed that the total average delay to the five scheduled daily high-speed passenger roundtrips was an estimated 10.5 minutes, or approximately one minute per train. Overall, extensive analysis of the trouble ticket data showed that the four-quadrant gate and vehicle detection equipment are as reliable as the conventional crossing gate while providing additional protection.
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