Agencies responsible for rail rapid transit projects are increasingly aware of the area of system assurance, including reliability, maintainability and safety. Specifications call for contractors to include system assurance programs establishing objectives, with supporting organization, procedures and documentation. This recognizes the contribution of system assurance in determining quality of service offered. Recently this thinking has been extended to a conceptual command and control system for a rapid transit system. The conceptual system is a baseline from which final performance and hardware specifications could be developed after analysis of variations therefrom. The baseline system permits automatic operation and takes advantage of the facts that acceptable performance can be achieved without an excessive number of commands, and that recent developments in rail insulated joints offer high reliability of insulated track circuits. This permits use of power-frequency track circuits modulated by a limited number of command codes. The result is a relatively low system component count and reduction in active elements, factors with favorable impact on system availability. Principal command and control functions included in the baseline system, and subjected to system assurance analysis, include vehicle direction, speed, train separation, station stopping profile, platform positioning, door control, station dwell time, and train to wayside communication. Analysis indicates configuration variations are possible which could appreciably increase the estimate of mean time between failure while maintaining fail-safe standards of baseline system.

  • Corporate Authors:

    General Railway Signal Co

  • Authors:
    • O'NEILL, J
  • Publication Date: 0

Media Info

  • Features: Figures; References;
  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00152677
  • Record Type: Publication
  • Source Agency: General Railway Signal Co
  • Files: TRIS
  • Created Date: May 31 1981 12:00AM