alt Hacker NewsI always thought there is a system of rail signals which should prevent accidents like this always in place, like dividing railroad into sections, turn on red light if the next section is occupied, yellow before that and so on...
Did it fail somehow which lead to this accident? I think such systems must be redundant enough to survive even without power/computers?
Better article:
https://inews.co.uk/news/39-dead-two-high-speed-trains-colli...
- A fault in the signaling system caused an Iryo and a Renfe train to stop -- the Iryo train was in front.
- For some reason, the control center authorized the Renfe train to proceed at full speed, despite the cab signaling showing it should stop. It then hit the Iryo train that was stopped in front of it.
Reading between the lines, it sounds like the main issues that caused this are likely:
- Poor / improper maintenance causes the primary signaling/communication system to frequently fail. The standard "correct" behavior in this case is to manually authorize stopped trains to proceed slowly (at approx 10 mph so they can stop if they see another train) to the next station and wait for the system to be restored.
- Since the system was frequently failing and proceeding at slow speeds causes severe operational slowdowns, the control center started allowing them to proceed at linespeed instead, possibly with some ad-hoc checks to make sure the track was clear.
- That got normalized, and whatever ad-hoc checks (if any) they were doing failed in this case.