Section 19(7) in The Delhi Metro Airport Express Line, General Rules, 2010
(7)(i)Some lines of the network are equipped with Automatic Train Operations in which the acceleration, braking, observance of speed restrictions and observance of signal commands are undertaken automatically and the train operators shall close the train doors and start the train from a station and monitor its functioning;(ii)all Passenger trains are equipped with Automatic Train Protection equipment and can be driven manually under the control of the Automatic Train protection system, any over speed or failure to brake at the appropriate time results in an irrevocable emergency brake application which shall be referred to as Coded Manual Mode;(iii)if Automatic Train Protection information is not available from the track side equipment, the train can be driven with traffic controller's permission in "Restricted Manual" Mode in which the on board Automatic Train Protection equipment restricts the speed of the train to twenty five kilometers per hour and when the Automatic Train Protection information is again available from the track, the mode automatically upgrades to Coded Manual;(iv)if the on board Automatic Train Protection equipment is also defective, the train may be driven in High Speed Cut out Mode or Low Speed Cut out Mode of control as authorised by Traffic Controller and when authorised by the Traffic Controller, the train operator may open and operate a sealed switch and drive the train without Automatic Train Protection and in this mode the train operator shall limit the speed of the train at forty kilometers per hour in High Speed Cut Out Mode and twenty five kilometers per hour in Low Speed Cut Out Mode and be responsible for safe movement of the train.
