 Assuming that the signal lever had frozen (when in fact it was electrically locked by the stationary train), he authorised the driver to pass the signal at danger, and the train set off into the still-falling snow.Glancing again at his diagram, he saw that the lights towards Beaconsfield were not in fact lit, and realised that the empty train was still in the section near Seer Green.He quickly went to the window and tried to attract the driver's attention by shouting, but nobody heard him.