How could a high-speed train collide with a stationary train? This is what we know so far about the train disaster in Toledo

A train collision near Urda, Toledo, resulted in at least 68 fatalities and numerous injuries. A high-speed train crashed into a stationary train due to a failure in the safety system, which had been compromised by a communication error among three computers. Despite a red signal indicating the track was occupied, the control center allowed the Renfe train to proceed. Witnesses described chaotic scenes as passengers attempted to escape through windows. The Spanish government is investigating the incident, with a focus on potential human error and the outdated safety system. This tragedy follows another serious train accident in January.