tl;dr: A Renfe high-speed train slammed into the back of a stationary Iryo train south of Madrid, killing at least 69 people and injuring over 100 in Spain's worst rail disaster since 2013. Transport Minister Óscar Puente blamed a computer failure followed by an "inexplicable" decision by the control center to let trains resume at normal speed; leaked audio suggests controllers cleared the Renfe train to proceed at full speed despite knowing the Iryo train ahead was stalled on the tracks.