A continuous increase of the demand for high-speed traffic, freight tonnage as well as of the train operating frequency is worsening the decay conditions of many railway infrastructures. This occurrence affects economy-related business as well as it contributes to raise maintenance cost. It is known that a failure of a railway track may result in tremendous economic losses, law liabilities, service interruptions and, eventually, fatalities. Parallel to this, requirements to maintain acceptable operational standards are very demanding. In addition to the above, a main issue nowadays in railway engineering is a general lack of funds to allow safety and comfort of the operations as well as a proper maintenance of the infrastructures. This is mostly the result of a traditional approach that, on average, tends to invest on high-priority cost, such as safety-related cost, compromising lower-priority cost (e.g., quality and comfort of the operations). A solution to correct this trend can be to move from a reactive to a proactive action planning approach in order to limit more effectively the likelihood of progressive track decay. Within this context, this paper reports a review on the use of traditional and non-destructive testing (NDT) methods for assessment and health monitoring of railway infrastructures. State-of-the-art research on a stand-alone use of NDT methods or a combination of them for specific maintenance tasks in railways is discussed.

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Our participation in the COST (European Cooperation in Science and Technology) programme gave us significant insights into the importance of explaining scientific findings to non-scientific audiences. In the framework of COST Action TU1208 "Civil engineering applications of Ground Penetrating Radar" we organised a series of dissemination activities to increase public awareness about ground penetrating radar (GPR) capabilities and applications, as well as to establish a dialogue with stakeholders and end-users of our research. Most of our educational and promotional activities were carried out in less-research intensive countries of the European continent, and we denominated the overall science communication initiative "TU1208 GPR Roadshow". The purpose of this paper is to present descriptions, principles, and results of our Roadshow.