It was caused Causation when a busy signalman , Alfred Sutton , forgot GiveUp about a pair of light engines waiting Motion at his down ( northbound ) starting Process_start signal to return Arriving to their shed at Carlisle .

Defending champion Sutton finished Process_end seven strokes back , in a tie for fifth place .

Two people died Death in the incident : the pilot , Pete Barnes , 50 , and a pedestrian , Matthew Wood , 39 , from Sutton in south London .