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PROBLEMS OF INTERACTION BETWEEN VEHICLE AND TRACK. PERMITTED SERVICE TOLERANCES OF THE PERMANENT WAY IN RELATION TO THE STATE OF THE TRACK AND THE RIDING OF VEHICLES

Within the sphere of the work on Question C 9, the relations between the state of the track regarding alignment and top and the riding of the vehicle were still further to be investigated. The data supplied by the various railway Administraions should be used to compile the information on the appropriate permissible track tolerances, the values of which were to be related to the riding of the vehicle. The results obtained from tests made by the various railway Administrations have confirmed that the guiding forces between vehicle and track as well as the riding stability of vehicles are greatly influenced by the state of the track regarding alignment and top and the tolerance permitted in the track (see Questions B 6, B 10, B 37, B 52). The track is subject to wear and deformation under the effects of the rolling loads, so that considerable deviations from the theoretical nominal dimensions may arise. The limiting maximum values allowed for these deviations are called the "permitted service tolerances". When these permitted service tolerances (=tolerances admises en service) have been attained or even before this, the track is systematically overhauled. The remaining permissible deviations with respect to the theoretical dimensions are called "maintenance tolerances". Apart from the limits of accuracy prescribed by the technique, the accuracy of the state of the track regarding alignment and top, i.e. the close limit of the tolerances, constitutes an economic problem. Too liberally dimensioned tolerances incur other disadvantages in respect of the guiding forces, the riding stability and the wear. The questionnaire "Relations between the state of the track regarding alignment and top and the riding of vehicles", which had been drawn up by the rapporteurs of the DB, was sent to the Member Administration under cover of an ORE letter the 16th of May 1956. A supplement to this questionnaire was sent out January 1960. The replies received from 17 railway Administrtions have been evaluated in the following report (SNCF, BR, DB PKP, FS, SJ, JZ, MAV, OBB, SNCB, NSB, CP, NS, CFF, DSB, CFL, and BCK (narrow gauge)).

  • Supplemental Notes:
    • Restrictions on the use of this document are contained in the explanatory material.
  • Corporate Authors:

    International Union of Railways

    Office of Research and Experiments
    Utrecht,   Netherlands 
  • Publication Date: 1961-4

Media Info

  • Features: Appendices;
  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00053196
  • Record Type: Publication
  • Source Agency: International Union of Railways
  • Report/Paper Numbers: C9/RP 4/E Intrm Rpt.
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM