The investigation is continuing, but the TSB is saying as of now, it looks like not enough brakes were applied to properly hold the weight of the train.
It doesn't say whether it was human error or a deficiency of the procedures... either way, I can't imagine the last employee whose job it was to apply the brakes will be getting much sleep in the future.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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