How did the Spain train crash happen and what will investigators be asking?

The Quick Take
Audio appears to point the finger at the control centre, but there are also questions around signalling and technical issues At least 69 people died when a high-speed train from Madrid to Seville hit another train on the same track from behind near Toledo on Wednesday morning. Both trains had been brought to a halt earlier when the signalling system failed. The driver of the state-owned Spanish tr
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