Sunday's high-speed train crash in southern Spain, the worst in over a decade, has been a devastating tragedy for the country, with the loss of at least 42 lives. Amid the grief, many are asking what could have caused such a failure on one of Europe's most admired rail systems.

The CIAF rail investigatory commission has started analysing why a train travelling north from Málaga was derailed on a straight section of the route, causing it to collide with an oncoming train, which was also derailed.

The Spanish government has described the accident as extremely strange. Three bodies already located in the wreckage were recovered on Tuesday afternoon, and a 42nd victim was also found at the crash site near Adamuz.

The shock felt in this sleepy town has been compounded by confusion at how a rail route that ran efficiently for so long suddenly failed. After its inauguration in 1992, Spain's high-speed rail, or AVE, network was seen as a symbol of the country's modernisation. Built with EU funds, it provided a state-of-the-art transport system that was fast, efficient and safe.

A derailment near Santiago de Compostela in 2013 that killed 80 people was not part of the AVE network, although that train was travelling at high speed. Sunday's collision, however, took place on the oldest AVE route, that which connects Madrid with Andalusia.

Several officials, including the president of Renfe, the national rail operator, Álvaro Fernández Heredia, said that human error was almost certainly not the cause of the accident, given that neither train was travelling at an excessive speed. Interior Minister Fernando Grande-Marlaska insisted that sabotage was not a possible cause.

Investigators are examining the train owned by Italian firm Iryo, which was manufactured in 2022. Transport Minister Óscar Puente stated that carriage number six of the train would be closely examined, as it was the first to derail.

Moreover, the section of track where the derailment occurred will be analyzed in a laboratory. A broken part of the track at the crash site has raised speculation about its role in the incident. The government has emphasized that such damage might have been inflicted by the collision's force.

It has been revealed that rail infrastructure administrator Adif highlighted eight technical issues on the line near where the accident occurred over the past year, mostly related to signaling. Adif has since reduced the speed limit along a 150-km (93-mile) stretch between Madrid and Barcelona due to concerns over the rail line's condition.

Many social media users have flagged previous complaints regarding disturbances during AVE journeys, indicating a public concern over the condition of the high-speed rail network. Prime Minister Pedro Sánchez assured that once the investigation completes, the findings will be shared transparently with the public.

This urgent investigation could hold significant implications for the future safety and reliability of Spain's famed rail system.