Certification against EN standards on railway dynamics in particular, together with the relevant technical annexes of the High Speed TSI, following various tests methods, extend train delivery times for months. Besides, the tests do not always capture all operating conditions. There is thus a risk of failure or unsafe approximation in such tests. In addition to this, some uncontrolled environmental and other boundary test conditions combined with restrictive operational limits can influence results. The costs and duration of tests performed in such conditions are also often increased by the need to do these tests several times so as to explore as much as possible all the range of environmental and boundary conditions and secure the results.