He says that around 8:30am this morning, the LZB controlling system failed due to communications issues, leaving no coverage for just over 60km of the track, which in turn triggered an automatic stop for six trains on that stretch.

But around 8:36, the Adif control centre issued a manual instruction to override the warning and let the traffic resume.

He heavily suggests that this “inexplicable” decision should not have been made, as trains should have remained under strict orders not to move.

The Guardian

Based on my experience with automated systems that sounds like a situation where the operator has to routinely ignore the red light because it doesn't work correctly.

Any system in the modern day that relies on one person seeing a light or else 68 people die feels like it has some corners cut somewhere.

Yikes someone didn't sleep well that night.