Section 50(2)(i) in The Delhi Metro Airport Express Line, General Rules, 2010
(i)If traction power is lost, all trains shall coast as far as the momentum of the train and the signaling system permit, after ascertaining from traffic controller that there is no defect in the overhead contact system, the objective is to get every train to a platform or as close to the platform as possible where passengers can be detrained if the incident is likely to be prolonged;