As part of the heavy axle load (HAL) revenue service mega site testing program, the Transportation Technology Center, Inc. (TTCI) has worked closely with the Union Pacific Railroad (UP) to address bridge approach problems under HAL operations. The testing program targeted two bridge locations at the western mega site (located near Ogallala, NE, on a heavy haul coal route of UP) for remediation and long-term performance monitoring. One location was selected in September 2007, while the other was selected in June 2009. Before remediation, these two locations required localized maintenance work on a quarterly basis (approximately 63 Million Gross Tons [MGT]) due to excessive track geometry degradation, mud pumping, and track component failure-see Figure 1. After remediation, no localized maintenance (except regularly programmed surfacing operations for the entire line) was required for more than 1,000 MGT, which indicated that the problems were effectively addressed.
Railroads have begun to use under tie pads and under ballast mats in rail track construction to better distribute train loads, reduce the track modulu...
Association of American Railroads. Transportation Technology Center, Inc. (TTCI)
2008-12-01
Abstract:
In 2006, two new weld tests were installed in the High Tonnage Loop (HTL) at the Facility for Accelerated Service Testing (FAST) located at the Transp...
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