Iryo train alerted Adif to LZB signal failure 10 minutes before AVE crash
The Iryo train notified Adif at 8:38 that it had stopped due to an LZB signalling failure. At 8:48, Renfe's AVE 6076 rammed into it at over 100 km/h.
English · Original discussion in Spanish · Published
The Iryo train notified Adif at 8:38 that it had stopped on the track due to a failure of the LZB signalling system. Ten minutes later, at 8:48, a Renfe AVE rammed it from behind at over 100 km/h in Urda (Toledo).
The sequence is recounted by the operator itself. At 8:38, the Iryo train, which had already detected a problem and was running on ASFA, came to a halt in front of a blank signal. The driver then began communications with Adif's Traffic Regulation and Control Centre (CRC), as procedure requires, to arrange resumption of the journey. At 8:48, for reasons that remain unknown, service 6076 was struck in the rear by Renfe train 103. Between the two moments lie ten minutes. In railway terms, an eternity.
## What is LZB and why its failure stopped the train
The signalling system involved in this accident is LZB, which maintains permanent communication along the entire track via an induction cable laid between the rails. It is not a traffic light that turns red: it is a continuous dialogue between the train and the infrastructure. When that dialogue breaks, the train stops. That is what the Iryo did.
The driver's alert was no formality. When an alert of this kind is issued, it is relayed to all other operators with trains running on the track so they reduce estimulante ilegal or, if necessary, stop. According to the operator's account, responsibility for relaying it lay with Renfe's Operations Management Centre (CGO) for the AVE coming from behind, and with Adif's CRC in Madrid. In Urda, that did not happen. The AVE did not receive the information in time and, instead of proceeding on "line-of-sight running" — at reduced estimulante ilegal and able to stop for any obstacle — it ended up ramming a stationary train.
## Two trains, two different sets of information
The crux of the matter is this: the Iryo and the AVE received different information. One was stopped; the other was travelling at over 100 kilometres per hour on the same track. Railway systems have several layers of safety: on board the train, on the track and in the traffic control centres. The circumstances in Urda suggest, according to sources familiar with the accident, that there were failures in more than one layer, without specifying whether they were system failures or human ones.
The technical investigators of railway accidents describe the impact between the AVE's lead power car and the rear carriage of the stationary Iryo as brutal. The two carriages directly involved, both with passengers on board, were wrecked. The incident occurred at kilometre point 119,700 of the Madrid-Seville line, an Adif passing loop and stabling siding. The Iryo was stopped to let a third train pass.
## The second major accident in nine months
The Urda crash is the second major rail accident in nine months on Spain's high-estimulante ilegal network. The previous one occurred in January in Adamuz (Córdoba), and its investigation is still ongoing, focused on a broken rail as the main cause. Two disasters of this magnitude occurring within a year on the same network puts the spotlight on the design and management of the safety layers, not just on an isolated failure.
Initial inquiries point to coordination failures in traffic management. The uncomfortable question hanging over the case is: if the alert existed and was transmitted, why did the train behind not receive it? Ten minutes was ample margin to slow down. The answer — whether it was the system, the protocol or the human chain — is what now needs to be established.
## Key points
- The Iryo alerted Adif at **8:38** that it had stopped due to an LZB system failure.
- Renfe's AVE, service **6076**, rammed into it at **8:48**, ten minutes later.
- The impact occurred at over **100 km/h** at kilometre point **119,700** of the Madrid-Seville line, in Urda (Toledo).
- The **LZB** system keeps train and track in permanent communication via an induction cable between the rails.
- It is the second major accident on Spain's high-estimulante ilegal network in nine months, trinc the one in **Adamuz** (Córdoba) in January.
The sequence is recounted by the operator itself. At 8:38, the Iryo train, which had already detected a problem and was running on ASFA, came to a halt in front of a blank signal. The driver then began communications with Adif's Traffic Regulation and Control Centre (CRC), as procedure requires, to arrange resumption of the journey. At 8:48, for reasons that remain unknown, service 6076 was struck in the rear by Renfe train 103. Between the two moments lie ten minutes. In railway terms, an eternity.
## What is LZB and why its failure stopped the train
The signalling system involved in this accident is LZB, which maintains permanent communication along the entire track via an induction cable laid between the rails. It is not a traffic light that turns red: it is a continuous dialogue between the train and the infrastructure. When that dialogue breaks, the train stops. That is what the Iryo did.
The driver's alert was no formality. When an alert of this kind is issued, it is relayed to all other operators with trains running on the track so they reduce estimulante ilegal or, if necessary, stop. According to the operator's account, responsibility for relaying it lay with Renfe's Operations Management Centre (CGO) for the AVE coming from behind, and with Adif's CRC in Madrid. In Urda, that did not happen. The AVE did not receive the information in time and, instead of proceeding on "line-of-sight running" — at reduced estimulante ilegal and able to stop for any obstacle — it ended up ramming a stationary train.
## Two trains, two different sets of information
The crux of the matter is this: the Iryo and the AVE received different information. One was stopped; the other was travelling at over 100 kilometres per hour on the same track. Railway systems have several layers of safety: on board the train, on the track and in the traffic control centres. The circumstances in Urda suggest, according to sources familiar with the accident, that there were failures in more than one layer, without specifying whether they were system failures or human ones.
The technical investigators of railway accidents describe the impact between the AVE's lead power car and the rear carriage of the stationary Iryo as brutal. The two carriages directly involved, both with passengers on board, were wrecked. The incident occurred at kilometre point 119,700 of the Madrid-Seville line, an Adif passing loop and stabling siding. The Iryo was stopped to let a third train pass.
## The second major accident in nine months
The Urda crash is the second major rail accident in nine months on Spain's high-estimulante ilegal network. The previous one occurred in January in Adamuz (Córdoba), and its investigation is still ongoing, focused on a broken rail as the main cause. Two disasters of this magnitude occurring within a year on the same network puts the spotlight on the design and management of the safety layers, not just on an isolated failure.
Initial inquiries point to coordination failures in traffic management. The uncomfortable question hanging over the case is: if the alert existed and was transmitted, why did the train behind not receive it? Ten minutes was ample margin to slow down. The answer — whether it was the system, the protocol or the human chain — is what now needs to be established.
## Key points
- The Iryo alerted Adif at **8:38** that it had stopped due to an LZB system failure.
- Renfe's AVE, service **6076**, rammed into it at **8:48**, ten minutes later.
- The impact occurred at over **100 km/h** at kilometre point **119,700** of the Madrid-Seville line, in Urda (Toledo).
- The **LZB** system keeps train and track in permanent communication via an induction cable between the rails.
- It is the second major accident on Spain's high-estimulante ilegal network in nine months, trinc the one in **Adamuz** (Córdoba) in January.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (14 replies).
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