EVALUATION OF RAIL BEHAVIOR AT THE FACILITY FOR ACCELERATED SERVICE TESTING

Results of two experiments conducted at the Facility for Accelerated Service Testing to investigate the wear and defect behavior of various rail metallurgies under unit train operations are presented. Five types of rail were used: standard carbon, high-silicon, head-hardened, chrome molybdenum, and fully heat-treated. The load demarcation between the two experiments was at a traffic loading of 122 million gross Mg (135 million gross tons). In the first experiment, a condition of underlubrication existed up to 36 million-41 million gross Mg (40 million-45 million gross tons), after which point lubrication could be described as generous, a condition maintained throughout the second experiment. Railhead profile measurements taken in both experiments revealed that head-hardened and chrome molybdenum rail exhibited the best resistance to high-rail curve wear. In the first experiment, there was a strong lubrication-metallurgy interaction that caused the premium metallurgies to benefit less than standard rail from generous lubrication. In the under-lubricated condition, the 1:14 tie-plate cant produced about 20 percent more gage-face and head-area loss than the other cants. The cant effect was considerably reduced by generous lubrication. Position-in-curve effects were dependent on the level of lubrication. When generous lubrication permitted the accumulation of greater loads on the rails, fatigue failure became the dominant failure mode in both railhead and weldments. Standard rail exhibited the greatest number of failures from railhead fatigue.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 6-15
  • Monograph Title: Railroad track and facilities
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00319304
  • Record Type: Publication
  • ISBN: 0309030528
  • Files: TRIS, TRB
  • Created Date: Dec 11 1980 12:00AM