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What happened in Spain's high speed train crash?

The Sunday train derailment and collision in southern Spain left at least 122 people injured and 39 dead. Officials cited the "strangeness" of the accident, which occurred on a straight section of rail, and one theory suggested that the cause was a broken rail joint.

What we know about the situation so far is:

The accident occurred at 7:45 pm (1845 GMT), near the town Adamuz, in the province of Cordoba. This is about 360 km (225 miles) south of Madrid.

Two high-speed trains were involved, one operated by the private consortium Iryo and the other by Alvia which is run by Spain's national railway company Renfe.

The Alvia train was hit by the last two of eight carriages from the red Iryo, which had been travelling between Malaga and Madrid. This caused the first two carriages on the Alvia to fall and derail up to a five-metre (16.4-foot) embankment.

What Officials Are Saying According to Renfe Chief Alvaro Fernandez Heredia who said that human error is virtually eliminated, there was only a 20 second interval between the derailment of the train and the impact.

He said that it would take some time to determine whether the failure was in the rolling stock or infrastructure.

Officials stated that the Alvia appeared to have hit the Iryo's derailed carriages, or debris under the Iryo's chassis. Renfe reported that the 27-year old driver of the Alvia train was killed in the accident.

Iryo was a train that carried around 300 passengers and just left Cordoba, a historic city. The train was travelling at 110 kph when the accident occurred, which is well below the 250 kph maximum speed limit on this stretch.

Renfe reported that the oncoming train was traveling at a speed 205 km/h.

In the first Alvia carriage, there were 37 people and in the second, 16 people. The majority of the injured and dead came from the first Alvia carriages.

Oscar Puente, the Transport Minister, said the Iryo is less than four-years-old and the railway track was completely renovated in May last year with an investment of 800 million euros. Iryo stated that the train's last inspection was on January 15th.

Puente described the accident as "tremendously bizarre" and stated that the derailment may not have caused any deaths if it wasn't for the approaching train.

Faulty Joint a Possible Cause? Sources briefed on the initial investigations said experts found a broken join, which may have created a gap in the rail sections. They believed this was key to determining the exact cause of the accident. Transport Ministry would only confirm that the joint broke as a result the accident and not earlier. They refused to provide any further comments. The ADIF, the state-owned administrator of rail infrastructure, did not immediately respond to a question about this claim.

Jose Trigueros said that his preliminary analysis indicated "failure of undercarriage of back units" of Iryo train.

He did not exclude a track problem, but said that nightly inspections using tamping machines were intended to detect rail fatigue. In this case, the control center automatically reduces circulation speed.

Previous problems The train drivers' union SEMAF warned ADIF last August that the track at the collision site was severely damaged by potholes, bumps and imbalances of overhead power lines.

ADIF didn't?respond immediately to a comment request.

A review of ADIF's X alerts shows that it previously reported infrastructure problems at Adamuz - from signal failures and overhead power lines to other issues - which caused high speed trains to be delayed between Madrid, Andalusia, 10 times, since 2022.

Iryo is a joint-venture between the Italian state railway operator Ferrovie dello Stato and Spanish infrastructure investment funds Globalvia. The service began in November 2022 with the Madrid to Barcelona route, and expanded to other major cities. Iryo's ETR1000 trains are manufactured in Europe by Hitachi Rail and Bombardier for Ferrovie unit Trenitalia. Renfe's Alvia train is manufactured by local manufacturers CAF and Talgo.

Everest Insurance, the leading insurer for Renfe provides compensation to passengers and their beneficiaries. Everest declined to provide details on the policy period and deductible when The Insurer contacted them. (Reporting and writing by Victoria Waldersee; editing by Sharon Singleton, Ros Russell, Aislinn Laing; David Latona; Emma Pinedo; Andrei Khalip)

(source: Reuters)