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Ballasted rail tracks are the most common type of transportation infrastructure. However, ballast progressively degrades under dynamic and impact loads. The degree of degradation will be accelerated due to the increasing demand for elevated speeds of passenger trains and heavier axle loads for freight trains. It is, therefore, necessary to develop novel and cost-effective technologies to enhance the longevity and performance of tracks through amended design and construction. Over the past two decades, a number of studies have been conducted by the researchers of Transport Research Centre (TRC) at the University of Technology Sydney (UTS) to investigate the ability of recycled rubber mats/pads, as well as waste tyre cells and granulated rubber to improve the stability of track substructure materials including ballast and sub-ballast layers. This paper presents an overview of these novel methods and materials based on comprehensive laboratory tests using iconic testing facilities. Test r

New south walesResearch centreUniversity of technology sydneyTransport research centreTechnology sydneyField testsArge scale laboratory testsRecycled rubber