A Model For The Life Expectancy Of Railway
Switches And Crossings For Maintenance And
Renewal Planning In Asset Management Systems
Author(s)
W.-J. Zwanenburg
Abstract
With the help of databases of the Swiss Federal Railways (SBB CFF FFS),
statistical analyses are carried out on the lifetime of railway switches (points)
and crossings. The expected lifetimes are attributed to different parameters
which influence the speed of geometrical degradation or wear of the material,
e.g. total train loads (expressed in cumulative tonnages), axle loads, train type,
the quality of the foundation.
First results confirm long known basic knowledge, e.g. a gradual increase in
the average replacement age due to better components and changing maintenance
politics.
At the same time unexpected results are found. Examples of these are the not
statistically confirmed reduced lifetime of a switch being placed in a curve, or
the complete irrelevance of the switch angle on their expected life duration,
although a shorter life with larger angles would be expected due to higher
dynamic lateral loads and jerk. Some explanations for these unexpected results
are given and are probably related to both the situation in the field and non
technical issues, like maintenance policy.
With this knowledge on degradation, a model is composed which is used to
forecast maintenance and renewal needs of switches and crossings To test the
model, an old asset database with switches and crossings is used, and the results
of the model (proposed replacements including the time of replacement) is
compared with the actually carried out works.
Keywords: railways, switches and crossings, renewal, maintenance, asset
management systems.
Keywords
railways, switches and crossings, renewal, maintenance, asset
management systems.
Related Book
Other papers in this volume
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