ANALYSIS OF TRACK PARAMETER HETEROGENEITY AS A COMPLEMENT TO GEOMETRICAL METHODS OF TRACK CONDITION RATING

The condition of a track may be defined by track rating indices (W indices at the PKP) taken from recordings by a track inspection car, or obtained by geometrical measurements (longitudinal dip and cross-sectional irregularities, without load or with a moving load, lateral displacement, etc.). By track heterogeneity, the writer means the differences that such indices reveal on lengths of line with identical make-up, similar age, and used by the same traffic. These heterogeneities, which may be caused by the laying or maintenance of the track, or by constructional features with different characteristics, are also likely to result in great differences in the rapidity with which these lengths of line deteriorate, necessitating earlier continuous track renewal. The article proposes methods of assessing these heterogeneities by tests based on classic statistics laws. Numerical examples thus deal with: heterogeneities in the W index, by the X to the 2nd power test; heterogeneities in the track gauge by a method called the "ZM test" taken from an American book referred to in the bibliography; correlations between rail dip and lateral displacement under a moving load, by an analysis of sequential correlation. These complex analyses are not used as a basis of routine maintenance decisions, but in investigations for the purpose of explaining abnormal phenomena.

  • Corporate Authors:

    International Railway Congress Association

    17-21 rue de Louvrain
    1000 Brussels,   Belgium 
  • Authors:
    • BALUCH, H
  • Publication Date: 1974-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 537-546
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095414
  • Record Type: Publication
  • Source Agency: International Railway Documentation, Selection of
  • Files: TRIS
  • Created Date: Jul 15 1976 12:00AM