Section 49(1)(iv) in The Bangalore Metro Railway (General) Rules, 2011
(iv)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 until the limit of authority under cab signaling and thereafter change to Restricted manual mode and stop short of about ten meters of stalled train;