Each year, SNCF Réseau declares to the tax authorities the rail transport companies that reserved train paths for passenger transport operations during the previous year and the number of train paths thus reserved. The declaration specifies the breakdown by region and for each region and the number of train paths ordered by the regional authorities. This declaration is made under conditions and deadlines set by decree and subject to the penalties set out in V of Article 1736.
A train path-kilometre corresponds to the journey reserved on a railway line at a given timetable with the SNCF Réseau company by a rail transport company.