Other Reports

Introduction of HAL Traffic (286 Cars) on Revenue Service Lines: A Preliminary Analysis

  • 01
  • Jan
  • 2001
AUTHOR: M. Carmen Trevizo, John D. Mazza, Duane E. Otter, David D. Davis
SUBJECT: Tracks & Structures
KEYWORDS: Wheel Load, Concrete Tie, Degradation, Heavy Axle Load
ABSTRACT: Preliminary results of the Association of American Railroad's (AAR) Heavy Axle Load (HAL) Revenue Service Monitoring Program suggest that the effects of HAL traffic on revenue service lines are very similar to those experienced on the High Tonnage Loop (HTL) at the Transportation Technology Center (TTC), Pueblo, Colorado. The AAR's goal is to monitor the degradation of track and track components in revenue service and/or in environments not found on the HTL at TTC's Facility for Accelerated Service Testing (FAST). This will allow the AAR to detect and advise the industry of FIAL traffic related findings not seen at FAST. A variety of tests are being conducted in selected revenue service lines to address the following areas of concern: concrete tie performance, performance of wheels and bearings, bridge performance, turnout and component performance, wood tie degradation, and track degradation on a low modulus subgrade.
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