Details of the collision
The accident occurred near the town of Urda, south of Madrid, when a train run by state-owned operator Renfe, carrying 397 passengers, smashed into the back of a stationary train operated by private company Iryo, which was carrying 147 passengers. According to Iryo, its carriages were "struck from behind" by the other train.
A reported issue with the automatic signalling system, described as a computer failure, had forced all trains to halt on the affected stretch. Leaked audio recordings published in Spanish media revealed conversations between train drivers and a control centre just minutes before the disaster. In one recording, a control centre operator told a Renfe driver, "Continue your journey and then proceed under [Lateral Signalling Block], at normal speed with normal operation." When the driver asked, "At normal speed?", the controller replied, "Yes."
In another recording, the driver of the stationary Iryo train reported that communication with the train-control system had been lost. The driver told the control centre, "The train is stationary in front of the entry signal at Urda." Despite this, a later recording suggests the controller was notified that the Iryo train remained stationary as the Renfe train approached.