system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are trains still not fully automatic but the world talks about fully autonom cars?

Isn't it way easier to make the railtrains full automatic?
Streets are much more complicated to drive and yet there are already cars which can drive without a human.
gpt
Automatic trains already exist in many areas (Paris metro, London DLR), however you still need a person present in case of problems and occasionally to take manual control. Also as Shenko-wolf says the systems aren't as reliable as the networks would have you believe.

On the other face of the coin, there are the unions fighting any change which is slowing down implementation, however you can't blame them - it is their job to protect the jobs of the workers.