Technical Reports

Tread Metal Buildup on Railroad Freight Car Wheels- Dynamometer Simulation

  • 01
  • Jun
  • 2003
AUTHOR: Federal Railroad Administration;
OFFICE: RPD
REPORT NUMBER: DOT/FRA/ORD-03/25
SUBJECT: Braking Systems
KEYWORDS: Tread metal buildup, Dynamometer, Wheels
ABSTRACT: Recent dynamometer tests on a composition metal brake shoe with a high metal powder content developed slight tread metal pick up during testing at the Federal Railroad Administration's Transportation Technology Center. Additionally, the brake shoes and wheels that developed tread metal buildup during these tests became magnetized. A dynamometer test matrix was created. The matrix included a range of brake application pressures to emulate both typical and abnormal brake function as well as water spray in an attempt to influence the result friction. No metal pickup was observed on any of the second set of test wheels. Therefore, brake shoe force, moisture and magenestism alone, or in combination , do not appear to be suffiecient in them to produce wheel built up tread based on the dynamometer tests conducted.
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