This is from the Spanish papers
The railway accident investigation commission (CIAF) has ordered the immediate transfer to a laboratory in Madrid of "the rails at the point where the derailment" of the Iryo Málaga-Madrid train began. It was this incident that then led to the collision with the Renfe Alvia Madrid-Huelva train, with 42 confirmed fatal victims so far.
According to commission sources, technicians consider it essential to examine the track in a controlled, interference-free environment, after the Guardia Civil's forensic unit confirmed the presence of "breaks" and/or "alterations", to establish whether the damage predated the accident. The aim is to establish whether the track was the cause of the incident on Sunday, 18 January.
The CIAF team have already held meetings with several police units, the duty judge and the railway companies involved in the accident (Iryo and Renfe), as well as with the rail infrastructure company of Spain (Adif). Together, they have been coordinating the "removal and custody" of the material, which was renovated very recently - in May 2025, thanks to a large investment.
Once in the laboratory in Madrid, these "complete sections" of the track, that have been found overturned and completely detached from the concrete sleepers on which they were supported, will be analysed.
The commission has decided to transfer at least 500 metres of track from line 1 (in the direction of Madrid). The material covers the distance from the exact place of the collision to the place where a "clean break" almost one metre in length has been found.
This is currently the focus of the CIAF's investigation, but it is not the only line of inquiry. On Wednesday, the Ministry of Transport confirmed that the commission team have already given orders to inspect the wheels of the Iryo train and "other trains that have recently travelled" through the accident site. This is an "advanced technical" procedure in which wear and cracks in the wheels and axles are detected.
The commission suspects that the "interaction" between Iryo's "running gear" (the axle and wheel system) and the previously damaged "infrastructure" (the track) may have been a key factor in the fatal accident. In other words, some component may have "touched" the defective track, causing it to become dislodged.