kolkata a fingerprotection padding that mutes the sensors in automated metro doors once the gap between them is 20mm or less worked against the 66yearold passenger in kolkata who was dragged to his death on saturday while trying to get into a coach after the flaps closed officials saidmetro railway came out with this hypothesis after using the same rake to recreate the circumstances in which sajal kanjilal died technicians and officers confirmed that the limit or relay switch fitted in the middle of the door will not send an alert to the drivers cabin and activate the traction motor if the gap between the flaps does not exceed 20mmkanjilal could have pulled out his fingers in the nick of time because the rubber lining is there precisely for that reason metro sources said officials dismissed reports that kanjilals hand got stuck between the closing doors till his wrist preventing him from pulling out before the train started movingthe idea is for the solid rubber lining to fit snugly into the hollow one and seal the door the rubber also ensures that a passenger is not hurt if the fingers get caught in between the passenger just has to pull them out a metro source saidthe commissioner of railway safety will probe the accident officials found a small portion of the rubber lining on the door flaps protruding slightly outward matching this with cctv footage they said he pushed his fingers through the rubber lining after the door closed in the few seconds that it takes for a train to start