The assessment of railway track conicity and the question of limit radius

Y. Bezin, A. Alonso

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper discusses the calculation of the equivalent conicity for railway wheel and rail profile, particularly the assumption that the radius of a curve can be neglected during the calculation. A simple Matlab program shows that the curve radius term can have an influence on the calculated equivalent conicity, and highlights the importance of defining a limit radius at which equivalent conicity cannot be used as a reliable measure of stability. The work is also supported by vehicle dynamics simulation and a methodology is proposed to show the relationship between dynamics oscillation forces and quasi-static curving forces as a function of curve radius, cant deficiency and vehicle speed. The current limit of 2500m based on EN14363 definition of very large radius curve is proved to be a sensible limit, however results from low speed freight traffic show that dynamic oscillation can also be an issue in tighter radius curve.

Original languageEnglish
Title of host publicationProceedings of the First International Conference on Railway Technology
Subtitle of host publicationResearch, Development and Maintenance
EditorsJ. Pombo
PublisherCivil-Comp Press
ISBN (Print)9781905088539
Publication statusPublished - 18 Apr 2012
Externally publishedYes
Event1st International Conference on Railway Technology: Research, Development and Maintenance - Las Palmas de Gran Canaria, Spain
Duration: 18 Apr 201220 Apr 2012
Conference number: 1

Publication series

NameCivil-Comp Proceedings
PublisherCivil-Comp Press
ISSN (Print)1759-3433


Conference1st International Conference on Railway Technology
CityLas Palmas de Gran Canaria


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