translate English to French: Freight Car Productivity Improvement Since 2004, the Association of American Railroads (AAR) has required all new freight cars to be equipped with trucks that self-steer around curves.
Amélioration de la productivité des wagons Depuis 2004, l’Association of American Railroads (AAR) exige que les nouveaux wagons soient tous munis de bogies qui s’auto-orientent dans les courbes.