The aim of this Master’s thesis is presenting two of the main phases of the lifecycle of a passenger regional train, namely post-production testing operations and maintenance. The first of the two processes is analysed from the point of view of an important industrial company acting in the field, Alstom Ferroviaria S.p.A, with a detailed overview of all the different steps constituting this crucial lifecycle phase. The second process, instead, is briefly introduced and a base for an algorithm for future predictive maintenance application is proposed. In particular, the first part of this work is intended to analyse the functional testing process of the Smart Coradia operated by Ferrovie Nord, named Donizetti, a high-performance, medium capacity regional train.