Simulation of marshalling yard operations has been developed, representing a significant advance over previous simulations. With emphasis on the frequency of overspeed (potentially damaging) impacts, it was validated using traffic and layout data from an actual yard. It reveals the dependency of overspeed impacts and poor track utilization on retarder release-speed policy and on the profile of the classification tracks. It is readily adapted to other yards and traffic flows. Features of the Monte Carlo approach include nine classification tracks, dual humpleads, realistic traffic flow features, interactions between moving cuts. The simulation program is in FORTRAN IV. Trial runs on a representative yard configuration indicate that substantial improvements are possible through use of a retarder release-speed policy employing velocity information in addition to that on position, and an altered gradient profile.

  • Supplemental Notes:
    • Contributed by the Rail Transportation Division of the ASME for presentation at the Joint ASME-IEEE Railroad Conference held in Washington, D.C., March 30-April 1, 1977.
  • Corporate Authors:

    American Society of Mechanical Engineers

    Two Park Avenue
    New York, NY  United States  10016-5990
  • Authors:
    • de Vries, G H
    • Kerr, C N
  • Publication Date: 1977-3-30

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00152429
  • Record Type: Publication
  • Source Agency: American Society of Mechanical Engineers
  • Report/Paper Numbers: Paper 77-RT-8 Conf Paper
  • Files: TRIS
  • Created Date: May 11 1977 12:00AM