LIVE: Spain’s transport minister holds press conference on train crash investigations

Key Concepts

• The derailment in Adamuz, Spain, is under intense investigation, focusing on infrastructure integrity, inspection protocols, and potential contributing factors.
• Extensive inspections, including ultrasonic testing of welds, were conducted prior to and following the infrastructure’s implementation, all passing certification.
• Increased monitoring frequency was implemented due to ongoing modernization work, not necessarily a change in safety thresholds.
• Data analysis from Talgo trains revealed anomalies but did not trigger automatic safety interventions.
• ADIF and Renfe are cooperating fully with the CIAF investigation and are committed to transparency.
• The incident highlighted limitations in current train localization technology, particularly in challenging terrain.
• ADIF is investigating the rail supplier, ArcelorMittal, for potential manufacturing defects.

Infrastructure & Modernization

The investigation centers on a recently modernized section of track, representing the final phase of a €780 million project with a final investment of €104.72 million. This modernization involves migrating to the RTMS security system while still utilizing the older LZB system. All completed work has received the necessary technical certifications. A detailed report confirms all 114 welds in the section passed ultrasonic inspection, verified by a certified inspector with a valid permit until November 2026, adhering to all regulatory parameters. The inspection process included visual inspection, liquid penetrant testing, geometric testing, and ultrasonic inspection.

Pre-Incident Inspections & Monitoring

Prior to the derailment, 13 track beatings were performed within a 10km radius of the incident site in 2025, with the last occurring on November 6th, 2025. Five dynamic tests were conducted between March and November 2025, exceeding the typical annual frequency of two to four. An ultrasonic rail test was conducted on November 10th, 2025. This increased frequency is attributed to a safety management system approved and overseen by the railway safety authority. ADIF’s safety management system allows operation with both national and European-level control, dictating inspection procedures.

Incident Data & Analysis

The derailment was described as “strange” due to its uncommon nature with passenger trains, though similar incidents involving freight trains in 2017 influenced current inspection protocols. Four incidents occurred in the four months leading up to the derailment: a ballast washout on October 30th, 2025, two animal strikes on October 31st, 2025, a detached train piece on November 25th, 2025, and a pantograph disjunction on November 26th, 2025. All were resolved and deemed unrelated to the infrastructure. Data from Renfe’s Talgo trains showed no immediate anomalies, though a minor “protuberance” was detected shortly before the derailment, not reaching alarm thresholds. Marks similar to those found on the derailed train were detected on two bogies of other trains, and a single mark on another. The CIAF’s report suggested heavier trains might be more susceptible to developing rail defects.

Investigation & Quality Control Details

Following the 2017 CIAF recommendations, track inspection procedures were enhanced. The current increased monitoring is linked to ongoing renewal work (partial superstructure and signaling upgrades) while maintaining service. All 114 welds were initially tested, and an independent firm re-tested 30% (36 welds) with both sets of tests validated and approved. ADIF maintains traceability to locate all rail batches and will conduct special inspections. The welding company is one of four with a railway division, but the specific workers involved are still being identified.

Communication & Technology Limitations

Initial notification of the derailment came from the 112 emergency services, not directly from ADIF. Renfe independently detected the Alvia’s stoppage and the presence of another train. Information regarding the Alvia was relayed to 112 around 20:00, followed shortly by information about the Irio. Current train localization technology has limitations, particularly in mountainous terrain like the Sierra de Córdoba, due to topography and satellite signal accuracy. The system identifies the circuit a train occupies, but not its precise position if derailed (even a 1-meter displacement is beyond its accuracy). Military-grade systems offer greater precision but are not currently deployed for civilian rail networks.

Related Incidents & Future Actions

A landslip on the R1 Rodalies line in Masanet Masanas was briefly addressed, with inspections conducted and a partial reopening planned. Repairs to the AP-7 highway, also affected by the weather event, are underway with a partial reopening scheduled. ADIF is conducting research on welding techniques and will investigate whether a manufacturing defect in the rail contributed to the accident, potentially pursuing penalties against ArcelorMittal. The implementation of the RTMS is not considered invasive to the track itself.

Conclusion

The investigation into the Adamuz derailment is ongoing, with a strong emphasis on thoroughness and transparency. Extensive inspections and quality control measures were in place, and the incident appears to be unusual. While current infrastructure monitoring is robust, the incident has highlighted limitations in train localization technology and prompted a review of rail manufacturing processes. ADIF and Renfe are committed to cooperating with the CIAF and implementing any necessary improvements to enhance railway safety.