Dynamic load factors (ϕ) relate the magnitude of vertical wheel-to-rail loads in operation (dynamic loads) to static loads resulting from the weight of the rail car and its contents, as a function of train speed. The ϕ equations are often used in the selection of rail steel and cross-sections (weight). Equations for ϕ have been put forth by the American Railway Engineering and Maintenance-of-Way Association (AREMA) and others. A limitation of the existing ϕ equations is that they have been derived from loads measured at instrumented sections of track and observe the many wheel loads but with constant track conditions. For this study, measurements of dynamic loads from two instrumented wheelset (IWS) as it conducted four passes over a 340 km section of track operated by a North American Class 1 freight railway through the Canadian Prairies. These measurements provided dynamic loads from one loaded freight car over various track structures at differing train speeds. This paper presents the IWS data sets and the variation of dynamic loads between multiple passes of the section of track studied, and the statistical distribution of dynamic loads. New ϕ equations are developed for tangent track and nontangent track (inclusive of bridges, grade crossings, curves, and switches).


    Access

    Download


    Export, share and cite



    Title :

    Railway Dynamic Load Factors Developed from Instrumented Wheelset Measurements


    Additional title:

    J. Transp. Eng., Part A: Systems


    Contributors:


    Publication date :

    2022-07-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Measurements of Wheelset Loads. Testing Facilities to Improve Load Calibration of Instrumented Wheelsets

    Lombardo, F. / Cavello, S. | British Library Conference Proceedings | 2004


    Railway wheel tread damage and axle bending stress – Instrumented wheelset measurements and numerical simulations

    Maglio, Michele / Vernersson, Tore / Nielsen, Jens C O et al. | Taylor & Francis Verlag | 2022

    Free access

    Nonlinear dynamic behaviour of a railway wheelset

    von Wagner, Utz | Online Contents | 2009


    Design methodology developed for wheelset

    Knani, K Bel | IuD Bahn | 2002


    WHEELSET FOR RAILWAY VEHICLES

    GARCÍA GARCÍA EMILIO / QUINTANA POLO VÍCTOR JAVIER / MIGUEL DE PRIEGO COQUIS JOSÉ CARLOS et al. | European Patent Office | 2017

    Free access