Technical Reports

Vehicle Track Interaction Truck Hunting

  • 01
  • Aug
  • 1989
AUTHOR: John F. Leary
SUBJECT: Facilities & Test Equipment, Track/Train Interactions
KEYWORDS: Wheel/Rail Forces, Wheel Profile, Rail Profile, Hunting Threshold, On-Set Speed, Rolling Resistance Stability Model
ABSTRACT: In an effort to better understand the practical aspects of the truck hunting response of two typical freight vehicles, a Federal Railroad Administration (FRA) test program was conducted at the Transportation Test Center (TIC). Axle and carbody accelerations were measured on a conventional design coal hopper car and an 89-foot intermodal flat car. Variables introduced into the test design included loaded weight on rail, truck design, side bearing configuration, and wheel profile. All test runs were conducted on the Railroad Test Track (RET) under completely dry conditions. On those runs calling for the CN Heumann wheel profile, instrumented wheelsets were used. This data was used to define the wheel/rail loads produced during truck hunting. A further effort was made to determine the force/acceleration relationship for a limited number of test configurations.