Comment by foldr
14 hours ago
That should never cause a crash. You don't let one train go onto a section of track unless you know that there's no other train on that section of track. If train A has failed to move when instructed, then train B waits for it to move.
That all is true, and furthermore the AVE train was running way above the 30 kmh limit set when the automatic control systems fails. The only way this accident could happen is if someone violated every existing procedure.