There are no conductors, there's a control room with system overview and links to metros, stations and service personnel.

See http://www.ansaldo-sts.com/sites/ansaldosts/files/brochures/... page 21.

Interestingly enough, all transit staff are trained to be conductors in cases when the automated system doesn't work. It recently snowed which incorrectly triggered the "something is on the track" sensors causing the entire system to stop. They just took all the people normally doing other tasks and made them manually drive the trains for a day until the snow melted.

I didn't know that, that's pretty damn awesome and excellent foresight.