Yes, L line in NYC is automatic train control system. If one is to walk to the end of every L train platform, one would see a sign that says "Automated Train Control System is in Effect"
It requires conductors because of the union contract requires them. Not only it requires an engineer "driving" the train (aka pushing a button "I'm here") but also the second one looking to make sure that the train doors can be closed ( or closing them on the person )
So just on the L train MTA can cut 50% of the conductors by fully engaging automated train control and merging door checker engineer duties with the "I'm here" engineer duties.
