Several industrialized countries, as well as a number of developing countries, including China and India, have launched major programmes to modernize their railway tracks, locomotives and rolling stock; such programmes may involve the expansion or introduction of high-speed rail systems.
Plusieurs pays industrialisés, ainsi qu &apos; un certain nombre de pays en développement, dont la Chine et l &apos; Inde, ont entamé de vastes programmes de modernisation de leurs réseaux de chemins de fer, de leurs locomotives et du matériel roulant.