Regarding the train accident in Spain, this line uses a 1970 LZB train protection system, for which spare parts are no longer available. My guess is that the LZB failed again, trains were running on manual control, and someone made a mistake. This is what happens when systems are allowed to deteriorate to an unimaginable degree. This picture shows the equipment responsible for the safety of the lines, at least 45 years ago.

Regarding the train accident in Spain, this line uses a 1970 LZB train protection system, for which spare parts are no longer available. My guess is that the LZB failed again, trains were running on manual control, and someone made a mistake. This is what happens when systems are allowed to deteriorate to an unimaginable degree. This picture shows the equipment responsible for the safety of the lines, at least 45 years ago.