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

Y. Bezin, A. Alonso

Research output: Contribution to journalArticlepeer-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
Article number55
JournalCivil-Comp Proceedings
Publication statusPublished - 2012
Externally publishedYes


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