The activities executed during the upgrade period are requested by the customer’s task document and they can include objective requirements of structural upgrades of the coach (without the ressistance structure)aswell as design. Therefor during the upgrade operations were executed modifications of the heating-ventilation types of the coaches (adaptation and modification of the ventilation and heating system by cycling the warm air near the windows), eco-toylets mounting, performant sound system mounting, modifying the electrical control panels by upgrading to performant components, smart access doors (with closing and self-block at a higher speed of 5km/h of the couch), using performant bogies (that can reach speeds higher than 160km/hour), using reinforced poliester/fiber doors (modulated elements used), in one word using last class materials.