THE WORLDWIDE RAIL TRANSPORT SECTOR
URBAN RAIL TRANSPORT
4 forms of urban rail transport
PRESENTATION OF THE VARIOUS FORMS OF URBAN RAIL TRANSPORT
The subway or metro, abbreviation of the “metropolitan” railway system, is most often an underground rail system, sometimes installed on viaducts and rarely above the ground.
Most subways use traditional rails separated by standard distances. Some subways use rubber tires on rails.
Certain subway trains were automated during the same period. At the beginning of the 1980s, fully automated conductor-free subways appeared, whether of a small size (Val to Lille , Toulouse  and Rennes in 2002) or a large size: the first was Line D in Lyon (1991), followed by Line 14 in Paris in 1998. The first automatic subways in Japan were also inaugurated during this period.