Spain train tragedy: Glitch, 3 operator errors behind crash that killed 68

The LZB failure removed an important layer of train control across 69 kilometres of track. Several trains stopped automatically, including the Iryo service and the AVE train behind it. The danger grew when the control centre allegedly allowed the AVE to restart at normal speed instead of using restricted operation.

The AVE was travelling quickly when it resumed its journey. About five minutes later, the Iryo driver told the control centre that her train was still stopped because of the signalling problem. She was also told to continue normally once able, but recordings showed no warning passed to the AVE driver. The AVE travelled about 25 kilometres before striking the Iryo train near Urda.

The investigation must establish how the malfunction and decisions combined. Transport minister Óscar Puente called the decision “inexplicable”. The Civil Guard and Spain’s Railway Accident Investigation Commission are examining the crash.

LZB is the train-control system identified in the article as operating on the affected railway section. Its role is to help control train movements and speeds. The malfunction mattered because it automatically stopped several trains and removed the normal control arrangement from a 69-kilometre stretch of track.

When LZB is unavailable, railway procedures require trains to use trackside signalling. Drivers must proceed at sight speed rather than normal high speed. Industry sources cited by El Diario described that limit as no more than 40 kmph. This gives a driver more time to react to an obstruction or a train stopped ahead.

The article alleges that the control centre did not apply those precautions to the AVE train. Instead, it told the driver to resume at normal speed. The investigation will examine whether the relevant protocol was misread and whether the Iryo train’s position was overlooked.

The speed difference was about fivefold. Under the restricted procedure described by industry sources, trains should travel at no more than 40 kmph. The AVE, however, was travelling at around 200 kmph when it struck the stationary Iryo train. That gap greatly reduced the time available to detect and avoid danger.

The key mechanism is stopping distance. A train moving at roughly 200 kmph can require more than a kilometre to stop. A driver proceeding at about 40 kmph has much more time to observe trackside conditions and react to an obstruction. The article links sight-speed operation to this need for reaction time.

These figures help explain why the alleged authorisation was so serious. The AVE travelled approximately 25 kilometres after being cleared to continue. The investigation will determine the exact decisions and conditions that led to the collision, which killed 68 people.

Allowing the AVE to resume normally was dangerous because the control centre did not have certainty that the track ahead was clear. The LZB failure had already stopped the Iryo train and the AVE. Normal-speed travel removed the extra reaction time required during a signalling failure.

The danger became clearer when the Iryo driver contacted the control centre about five minutes later. She reported that her train was still stopped because of the signalling problem. The recordings showed no indication that the AVE driver was warned. The AVE then travelled about 25 kilometres before hitting the Iryo train from behind.

At around 200 kmph, a high-speed train can need more than a kilometre to stop. By contrast, sight-speed operation was described as no more than 40 kmph. The unanswered question is why the control centre authorised normal speed without accounting for the stationary train’s position.

The control-centre operator was responsible for applying the correct procedure after LZB failed. According to the report, the operator allegedly authorised normal-speed travel, apparently misread the protocol, and failed to account for the Iryo train’s location. The article presents these as alleged human errors, not established findings.

The AVE driver was told to resume the journey and did so. The Iryo driver remained stopped and contacted the control centre about five minutes later to report the signalling problem. She was told to continue at normal speed once she could move. Neither driver is described as receiving a complete picture of the other train’s position.

The recordings apparently contained no warning to the AVE driver about the stationary Iryo train. That missing communication is central to the investigation. The Civil Guard and Spain’s Railway Accident Investigation Commission are expected to establish each person’s contribution.

“Proceeding at sight” means replacing automated protection with cautious driving based on trackside signals and what the driver can observe ahead. The purpose is to ensure that a driver can react if another train, obstruction, or other danger occupies the line. It matters most when the usual automated system is unavailable.

The article says drivers should operate under trackside signalling and at no more than 40 kmph. They should not simply continue at the normal high-speed rate. At about 40 kmph, a driver has more opportunity to see a stopped train and brake. At around 200 kmph, a train may need more than a kilometre to stop.

The reported instructions did not follow that precaution for the AVE. The control centre allegedly told both services to continue normally once able. The investigation will assess how the protocol was understood and applied during the LZB failure.

Multiple protections matter because railway safety depends on detecting danger, controlling speed, and sharing accurate information. An automated system may fail, but trackside signals, restricted speeds, driver observation, and control-centre communication can still reduce risk. Each layer creates another opportunity to stop a collision.

In this case, the LZB malfunction automatically stopped several trains. The fallback procedure called for trackside signalling and sight-speed travel. That meant no more than 40 kmph, according to industry sources cited by El Diario. A warning about the stationary Iryo train could have added another protection. Instead, the AVE was allegedly cleared at normal speed and no warning appeared to reach its driver.

The investigation will establish how the layers operated and where they failed. Spain’s prime minister has pledged a full investigation and improvements to restore confidence in the rail network. The article does not specify what changes will be adopted.