I've always wondered why we don't have more sophisticated autopilots for trains. I recognize the importance of having staff on a train to deal with a lot of th

I've always wondered why we don't have more sophisticated autopilots for trains. I recognize the importance of having staff on a train to deal with a lot of the engineering, break, track and other equipment issues, but It's unclear to me why the actual driving (braking/acceleration) of the trains is still done by (often bored out of their skulls) train operators. I'm guessing the big element that was missing was sensing track obstacles and braking accordingly - in Singapore/Dubai they have doors limiting access to the track, and in vancouver they have (tending to failure in the winter) track sensors to see if anyone has hopped onto the track.