'Over-speed' the immediate cause of train derailment

Rail expert Christian Wolmar has told ITV News it is "pretty clear" the Spanish train derailment that "over-speed" was the cause of the accident, but that is only the immediate cause and further investigation is needed:

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Driver admits breaking limit

The driver of the train that derailed in northwestern Spain, killing 79 people, has admitted he was traveling at twice the speed limit when he approached the treacherous turn.