In Paris, "ligne 14" of the subway has been built fully automated, it opened in 1998 (~20yrs ago now!). "ligne 1" has also been transformed from manual to autom

In Paris, "ligne 14" of the subway has been built fully automated, it opened in 1998 (~20yrs ago now!). "ligne 1" has also been transformed from manual to automated in 2012. "ligne 4" is in progress of being transformed. This is possible. Easier for subway because the tracks are fully protected from any external impact: trees, animals, cars, humans, ... There has been a problem once with some stuff that fell onto the track from works on a roof. Quite rare in the subway though compared to trains. Also, in a subway, the distance would be shorter for employees of the company to come and assist passengers: it might take a few minutes between stations, where it could take dozens of minutes, even hours, on train tracks.