A train driver was killed and 40 people injured, four critically, after a train collided with another in the UK. Investigators have determined the train involved in the crash passed a red signal before the impact. The incident prompted a large-scale emergency response, with numerous ambulances and rescue crews dispatched to the scene. Authorities are currently working to determine the exact circumstances leading to the signal breach and the subsequent collision. The Rail Accident Investigation Branch (RAIB) is conducting a full investigation to understand the cause of the accident and prevent future occurrences. The focus remains on providing medical care to the injured and supporting those affected by the tragedy.