Full automation—without drivers—would typically require platform edge doors, which are expensive and troublesome to introduce without disrupting service, and ve

Full automation—without drivers—would typically require platform edge doors, which are expensive and troublesome to introduce without disrupting service, and very difficult on some of the curved platforms. The benefit for the cost involved really just isn't there; while drivers aren't cheap they aren't impossibly expensive in comparison with the average number of passengers per train.