Audio reveals exchanges between Spain train operators and drivers moments before deadly crash

Leaked audio recordings that were published in Spanish media have revealed conversations between train drivers and a control centre just minutes before a deadly crash on Wednesday morning, that has killed 69 people.
Officials are investigating the cause of the disaster, which occurred when a train from Madrid to Seville barrelled into a stationary train.
Three audio recordings between Madrid's control centre and two train drivers appear to show that one high-speed train was given clearance to move even though another train had stalled on the track, about 25km (15 miles) ahead.
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