I don't really understand why they don't "teleport". There are additional ways to get to a point ahead of a slowed down train with a replacement train, right? W

I don't really understand why they don't "teleport". There are additional ways to get to a point ahead of a slowed down train with a replacement train, right? When you see one is dragged down too much and starts clogging, introduce a new train in front that jumps in at an expected schedule, then slowly empty the old train and take it out of the loop when its empty. I haven't seen that but I'm not sure why its not done. I don#t think it will be more expensive in the long run than increasing slack. And the service experience and maintenance level is increased drastically.