In his report , the judge recommended Convincing modification of the lever actuating the automatic pilot .

Three signalmen were present Presence in the signalbox , the enquiry Criminal_investigation found Know that one of them had pulled Motion the wrong lever ; he had intended to set Placing the points for the incoming Arriving train but instead set Placing the points ahead of the Scarborough .

This therefore Causation disengaged the locking bar on the points for a few seconds before the Scarborough train reached Arriving it , allowing Preventing_or_letting them to be changed Change by the application of the wrong lever .