Section 50(1) in The Delhi Metro Airport Express Line, General Rules, 2010
(1)(i)If a train operator cannot isolate a defect on his train and is unable to move it under its own power, he shall secure the train and request the Traffic Controller for assistance;(ii)the Traffic Controller shall, if possible, instruct the train operator of the following train to drive as close to the stalled train as possible under Coded Manual mode and at the limit of authority under cab signaling, the Traffic Controller shall instruct the train operator of the assisting train to change to Restricted Manual mode, and to proceed at reduced speed and stop about ten meters short of the stalled train;(iii)in case it is more convenient to provide assisting train from the leading end direction, the Traffic Controller shall instruct the train operator of the assisting train to change the cab and proceed in the direction of the stalled train under Coded manual mode as far as limit of authority under cab signaling and thereafter change to Restricted manual mode and stop short of about ten meters of stalled train;(iv)the Traffic Controller shall instruct the train operator of assisting train to couple to the defective train by mechanical means only and to isolate all electrical connections to the defective train;(v)once the trains are confirmed as coupled, the Traffic Controller shall instruct the train operator of the defective train to release the brake of his train;(vi)the Traffic Controller shall then authorise the train operator of the assisting train, if in front to once again change the cab and to drive forward in Restricted Manual mode at slow speed while exchanging communication with the front cab of defective train until the assisting train has reached on platform of the next station;(vii)all passengers of the assisting train shall be detrained at the station and the combined consist shall then be moved forward until the defective train has completely reached on platform and then, the passengers of the defective train shall be detrained at the station and the combined consist shall be moved to the depot;(viii)the train operator of the assisting train, if in the rear, will drive the combined consist in Restricted Manual mode at a speed not exceeding ten kilometer per hour, while exchanging communication with the train operator of the defective train in the lead cab until the defective train is at the platform of the next station, all passengers shall be detrained from the defective train, and the combined consist shall then be moved further until the assisting train is completely on the platform, and all passengers of assisting train shall then be detrained at the station and the combined consist worked to the depot in Restricted Manual mode at a speed not exceeding ten kilometer per hour, with leading and intermediate train operators exchanging communication on cab to cab telephone particularly if being assisted from rear.
