Section 61(1)(ii) in The Delhi Metro Airport Express Line, General Rules, 2010
(ii)High Speed Cut out Mode - this mode shall be employed only under specific instructions from the Operations Control Centre, in which the operation in Automatic Train Control Cut-out condition the propulsion system would cut out traction of the train above forty kilometer per hour and the train operator shall manually drive the train in accordance with the line-side signals and shall monitor and limit the speed of the train if it exceeds forty kilometer per hour, by service brake application.