A train driver disregarded a red stop signal, leading to a collision between two passenger trains north of London. The driver of the train that ran the signal was killed in the crash. Emergency services responded to the scene and are investigating the cause of the incident. Authorities are working to determine the factors that contributed to the driver’s failure to stop. The collision has caused significant disruption to rail services in the area. Investigations will focus on potential mechanical failures, human error, and signaling system functionality. Further details are expected as the investigation progresses.