EVALUATION OF IMPROVED TRACK STRUCTURAL COMPONENTS UNDER SUB-ARCTIC CONDITIONS

One area of concern to railroads in the northern third of the United States is the effect of frost heave and subsidence on track geometry. The purpose of this study was to evaluate two methods of improving track geometry and reducing maintenance in sub-arctic environments. Test track sections were installed in frost heave areas of the Alaska Railroad. One installation was designed to evaluate concrete ties with adjustable fasteners. The other installation was designed to evaluate the effect of including an elastic polymer stabilizer in the ballast. The concrete tie adjustable fastener section performed satisfactorily. Ties withstood bending stresses induced by the unfavourable frost heaving support conditions. The fasteners provided an acceptable means of adjusting track during frost heave. Stabilized ballast effectively reduced track subsidence due to weak foundation support. However, other problems such as hardening of the binding material and migration of the unstabilized ballast layer, made the particular system used unacceptable at this time.

  • Record URL:
  • Supplemental Notes:
    • Prepared for U.S. Department of Transportation, Federal Railroad Administration, Office of Research and Development, Washington, D.C.
  • Corporate Authors:

    Portland Cement Association

    5420 Old Orchard Road
    Skokie, IL  United States  60077

    Alaska Railroad

    Real Estate & Procurement Office RR-20 Box 7-2111
    Anchorage, AK  United States  99510
  • Authors:
    • Weber, J W
  • Publication Date: 1979-1

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 100 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188689
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Report/Paper Numbers: FRA/ORD-79/01 Final Rpt.
  • Contract Numbers: DOT-69-25-0003-4144
  • Files: TRIS, USDOT
  • Created Date: Feb 27 1979 12:00AM