This one is the kind of thing that's not supposed to be able to even happen (one train running into the back of another) if positive train control is implemented properly.
People rag on the USA refusing to allow higher speeds without PTC but their system is very simple and it works (it throws the train into emergency if it passes a red signal by physically knocking out the air).
People rag on the USA refusing to allow higher speeds without PTC but their system is very simple and it works (it throws the train into emergency if it passes a red signal by physically knocking out the air).