score:2
"Very closed, h*m*geneous and controlled" while true when you're comparing against planes or cars, is not true in absolute terms.
In a 200 km radius from where I live I have:
In essence, what it prevents from automatizing all network is:
Upvote:5
There are indeed quite a number of fully automated train lines.
And very many others with highly sophisticated automatic signaling that stops short of full automation.
The main reason for not going further is that the cost is considerable to modify an entire network to enable full automation, while the benefits are minimal: