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In fact, the crash at the origin of this whol debacle was caused by a train being stopped on the tracks and being rear-ended by another.

That's an interesting way of looking at the cause and effect. Trains unexpectedly stopping in an expected and inevitable property of all networks, whereas trains exceeding their movement authority is not.

Stopping a train anywhere should therefore always be safe, so the safety failing is with the train behind, not the one in front.

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