United States Department of Transportation
i
Instrumented Wheelset System Results Verified the High Speed Safety Standards [Research Results]
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2000-11-01
[PDF-598.22 KB]
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Abstract:To improve the safety of high-speed passenger coaches, the Federal Railroad Administration sponsored research to develop an instrumented wheelset system that collects wheel/rail forces and acceleration data on a high-speed passenger coach and then compares vehicle performance with newly adapted vehicle track interaction (VTI) safety limits. Data was collected over a 450 mile round-trip route on the Northeast Corridor (NEC) between Washington, DC, and New York City. This data was then compared to the VTI limits in the High-Speed Safety Standards to verify that the passenger coach ran under safe conditions. The completed tests demonstrated that the instrumented wheelset system accurately measures wheel forces and accelerations. A VTI exception report showed that there were no exceptions to the VTI safety limits specified in the standards for high-speed track safety on NEC throughout these tasks. Table 1 shows a summary of a VTI exception report from Wilmington to Baltimore when VTI limit is lowered to 60 percent of safety limit. This report lists the type of exception, the percent of the safety limit, peak value, speed, and location. As an example, the third row shows a net-axle lateral force on axle 2 that was -12,985 pounds. This corresponds to 86.6 percent from the limit of ±15,000 pounds. This occurrence happened at 7,695 feet South of milepost 36. This exception was also the highest occurrence for the entire round trip from Washington, DC to New York City.
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