Section 36(3) in The Delhi Metro Airport Express Line, General Rules, 2010
(3)Manual Secondary Door - (i) In case of emergency evacuation from tunnel or track side the Manual Secondary door may be opened from the track side by using a push bar;(ii)The door will be designed to swing open and be held at an open position of 90° and the door shall automatically revert to closed and locked position safely if it is left open at less than 90° without need for staff intervention.
