Section 19(5) in The Delhi Metro Airport Express Line, General Rules, 2010
(5)(i)The depot tracks may not be equipped with full complement of Automatic Train Protection and trains shall be automatically restricted to a maximum speed of twenty five kilometers per hour and the train operator may further restrict the speed of the train in the depot lines to a lower value as provided in the special instructions;(ii)movements within depots shall be controlled by fixed colour light signals;(iii)control of movements within the depot shall be exercised by a Depot Controller from a control panel or workstation located within the depot;(iv)the Depot Controller shall use a control panel or work-station for setting and clearing of routes within the depot;(v)instructions to train operators as to which siding they shall drive or give permission to depart may be given by train radio on a dedicated depot channel distinct from that used by Operations Control Center;(vi)in the event of the failure of the radio, a Public Address system may be used;(vii)either a verbal instruction or a proceed indication from the fixed signals shall be received before a train may move into a depot from main-line;(viii)both a verbal instruction and a proceed indication from the fixed signals shall be received before the train may depart from the depot on to the main line.
