Of course there exist automated trains. The question is whether automating an existing system makes sense, in terms of cost. The simple model chosen here is to

Of course there exist automated trains. The question is whether automating an existing system makes sense, in terms of cost. The simple model chosen here is to assume that automation requires platform screen doors -- and showing that the cost of installing those is on par with the cost of the drivers. Meaning the drivers represent a small amount of the total cost of the system.