Comment by jillesvangurp

There are plenty driverless trains in operations. Some have been running for decades. For example Toulouse in France has a metro without drivers since 1993. I was there a decade or so ago and sat in the front of the train on a bench in the front of the train staring out into the tunnel. Because there isn't a driver compartment. Really cool. They have some fences on the platform that align with the train doors for safety. The train lines up, people get in/out and it drives to the next station. Some airports have similar systems. This stuff has been possible for quite some time.

These days, you should be designing for autonomous operation for new infrastructure. Much easier when you design from the ground up. Not doing that could be an expensive mistake.