One of the immediate problems in track maintenance and improvement is Gage Widening. Track lateral stability has been of great concern in recent years, both from the thermal load aspects involved in the use of continuous welded rail, and the train dynamics aspects of heavier equipment and rail, and the train dynamics aspects of heavier equipment and longer trains. Two particular problems attributed to track-train dynamics interactions are wide gage and rail rollover. For this investigation of wide gage in tangent track, an experiment was conducted on a stretch of track on the Union Pacific Railroad near Pocatello, Idaho. Eight sections of track with different combinations of tie plates and fasteners were installed by the Union Pacific at a site noted for recent wide gage problems. The purpose of the experiment was two-fold: first, as a track train dynamics study, to identify specific factors contributing to development of wide gage; second, as a fatigue test, to evaluate the ability of various test sections to maintain gage under heavy, high speed traffic conditions. Measurements of gage and observations of track conditions at the test site were periodically collected by Union Pacific personnel, so that long term trends could be established. In addition, field experiments measured the dynamic response of the track to traffic during both summer and winter ambient conditions. Volume 1 presents a description of the wide gage experiments and results from the summer field experiment, during which 315 trains were recorded over a 3-week period about 1.5 million gross tons of traffic.

  • Supplemental Notes:
    • An International Government - Industry Research Program on Track-Train Dynamics. Requests for the publication should be directed to J.G. Britton, Director of Operations, AAR.
  • Corporate Authors:

    Association of American Railroads

    50 F Street, NW
    Washington, DC  United States  20001-1564
  • Publication Date: 1975

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 120 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00127711
  • Record Type: Publication
  • Report/Paper Numbers: AAR-R178
  • Files: TRIS
  • Created Date: Dec 3 1976 12:00AM