There are no fully automated train networks even close to the size and complexity of the MTA. Afaik they're mostly really simple point to point trains. Upgradin

There are no fully automated train networks even close to the size and complexity of the MTA. Afaik they're mostly really simple point to point trains. Upgrading the 7 line to CBTC costs billions, and that line was expressly chosen because of its limited interactions with other trains. Making the entire NYC subway "driverless" would probably cost on the order of hundreds of billions of dollars, if it could be done at all. There are more cost effective ways to reduce dwell times, to use your example.