 A contributing technical factor was the lack of double switching in the signal relay circuits, which would have prevented a single false feed causing an accident.The inquiry recommended the introduction of the Automatic Train Protection (ATP) system, although it is not certain this would have prevented the accident (ATP guards against driver error, not installation error).Following the Clapham Junction accident and two other fatal accidents in early 1989, British Rail was keen to implement the ATP system across the entire British railway network.