With a forecasted enlargement of the global railway infrastructure, ensuring more efficient and safer maintenance procedures are some of the main challenges that railway companies have to overcome. In this context, one of the most relevant and time-consuming maintenance procedures is the visual inspection of the underbody of the rolling stocks. It requires special maintenance facilities and it lies in the framework of reactive maintenance. A shift towards a predictive maintenance approach would allow for an increase in both efficiency and safety. This newer approach relies on the collection of sensory data, which is absent in the traditional visual inspection procedure.