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Thread: Hundreds of passengers injured in Shanghai subway crash!
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[quote=GUEST76218,444517]The problem is not really the signal failure. What happens world wide is that signaling systems can have a failure but when they fail they must fail safe. What that meens is that the signals return to stop and so all trains in the affected area come to a stop. It is what happens after this that I believe will be the underlying cause of both accidents. When the signals fail and trains stop you are left with 2 choices. 1) Wait on the stopped train until the repairs or checks are made to the signalling system. This could be due to many things but is normally rectifyable reasonably quickly by signals or computer technicians(say within a hour is ballpark figure) 2) Manually control the train movements over the affected area by communication with the driver and following strict procedural rules. This has risk because if there is any comunication missunderstanding accident can and have happened in many countries. This method happens all over the world,much more than people realise as signal failures are reasonably common and usually no accidents happen. The faster you want the trains to move with this the more risk as the final safety backup is usually that the driver will travel at a very low speed in as much that he can stop his train within his sighting distance. This is judgemental though as the exact distance it takes a train to pull up in is quite long an difficult to quantify especially for inexperiecd drivers. Because the people manageing the manual movement authorisations for the trains almost always get it right with no problems at times drivers become complacent and put ultimate trust in the system. Then is a mix up occurs, well we see the result. The other side of the arguement is that the public expect their trains to run on time and so they in a way contribute to the pressure to take this very small risk option. So I believe that while the signal failure put the situation in place that led to the accidents, it will be found that human error was the ultimate cause of both of them, either by the persons manageing/authorising the train movement or the driver.[/quote]
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