Adamuz, Córdoba, Spain – New details emerging from the investigation into the January 18th high-speed train collision near Adamuz, Spain, reveal a harrowing sequence of events. Analysis of the trains’ “black boxes” indicates a mere fifteen seconds elapsed between the initial derailment of an Iryo train and the subsequent impact with an oncoming Alvia train, according to a statement released Tuesday by the Railway Accident Investigation Commission (CIAF).
The crash, which occurred on a straight section of track recently refurbished in May 2025, remains Spain’s worst railway disaster since the 2013 Santiago de Compostela derailment. The incident resulted in 46 fatalities and left 292 injured, including 15 in critical condition. The Madrid–Seville high-speed rail line, operational since 1992, has a strong safety record, making this incident particularly shocking.
Timeline of the Tragedy
The CIAF’s analysis focuses on a critical 43-second period between 7:43 PM and 7:44 PM CET, the timeframe encompassing the derailment and collision. The Iryo train, traveling northbound from Málaga to Madrid with 289 passengers and 5 crew members, initiated the chain of events. The Alvia train, operating from Madrid to Huelva with an undisclosed number of passengers, was traveling on the adjacent track.
At 7:43:29 PM, investigators pinpointed an electrical disconnection within the Iryo train’s motor as the first anomaly detected, signaling the onset of the derailment. Just fifteen seconds later, at 7:43:44 PM, the Alvia train’s black box ceased recording data – a moment presumed to correspond with the impact. This suggests an incredibly short window for the Alvia train to react to the unfolding disaster.
Fractured Rail and Automatic Braking
The starting point of the Iryo train’s derailment, between the Loma del Partidor Norte tunnel and the Adamuz South switch, coincided with the location of a rail fracture identified by the CIAF. This discovery points to a potential structural failure as a key contributing factor to the accident.
Crucially, the derailment triggered an automatic emergency braking system on the Alvia train via the LZB safety system, a standard railway safety protocol. However, the limited time frame – fifteen seconds – raises questions about the effectiveness of this automated response in preventing a collision given the high speeds involved. The Alvia was traveling at 216 km/h at the time the emergency brake was activated, slowing to 204 km/h by the presumed moment of impact.
Electrical Disconnection and Temperature Alarm
Further analysis reveals that the electrical disconnection in the Iryo train is believed to be linked to “voltage disturbances or a lack of contact between the pantograph and the overhead contact line.” This initial anomaly occurred although the Iryo train was traveling at 205 km/h.
Four seconds after the initial derailment, the Iryo train occupied the adjacent track. Simultaneously, an alarm related to the temperature of the grease boxes on car number eight of the Iryo train was triggered, presumably because the car had already derailed. This alarm activated the train’s brakes, adding another layer to the complex sequence of events. Eight seconds after the initial derailment, the A645 switch lost verification, further compounding the situation.
Data Recovery and Ongoing Investigation
The CIAF extracted data from the trains’ black boxes on March 5th, creating three copies for analysis and legal proceedings. The commission is currently analyzing images from inside the Iryo train to reconstruct the sequence of events with greater precision and corroborate the data from the black boxes.
Investigators are also seeking data from the railway’s remote control system, managed by Adif, to gain a more comprehensive understanding of the conditions leading up to the collision. The initial black box data provides insight into the immediate moments before and during the crash, but lacks information about the events that followed.
What’s Next in the Investigation
The investigation remains ongoing, with the CIAF focused on determining the root cause of the rail fracture and evaluating the effectiveness of the safety systems in place. The findings will be crucial in preventing similar tragedies on Spain’s extensive high-speed rail network, the second longest in the world behind China’s. A full report detailing the investigation’s conclusions is expected in the coming months.
This incident underscores the critical importance of robust infrastructure maintenance, advanced safety technologies, and swift response systems in ensuring the safety of high-speed rail travel. The families of the victims and the injured are awaiting answers as the investigation progresses, hoping to understand how such a devastating event could occur on a modern, well-maintained railway line.
The next update from the CIAF is anticipated in late March, where they are expected to release preliminary findings regarding the rail fracture analysis. Archysport will continue to follow this story and provide updates as they become available.
