ASECOM RAILS has received for testing the order launched 1 year ago for the creation of software for calculating and checking all the elements making up a track. This order was defined and studied in collaboration with the Ecole Polytechnique de Paris. This innovative software, equipped with a powerful calculation engine used by the CEA, will enable us to check the stresses in each component of a track and thus validate the various possible choices according to the load elements applied to the system via the bearing rollers.