Gianluca Megna graduated in mechanical engineering in 2015 and got its PhD in Industrial Engineering in 2020. Currently he is employed as post-doc fellow at University of Pisa and lecturer of Urban Rail Transport at University of Florence. His research interests maily focus on railway systems with particular attention to vehicles and track design and their interaction in terms of structural assemssment, running dynamics, wheel-rail contact mechanics, noise and vibration problems. Prof. Andrea Bracciali graduated cum laude in mechanical engineering in 1988. He has been a Professor of Machine Design since 2004, lecturing on rolling stock design and manufacturing. He is the author of more than 150 articles. He is the founder and owner of a consulting company established in 1994. His research interests initially concern acoustics, vibrations, and machine dynamics in general. Subsequently, he worked on railway problems in a broader sense, on both vehicle and track and signalling problems. He holds several patents, from wheelsets to bogies for railway carriages, and from innovative railway wheels to insulated rail joints for automatic block signalling systems.