Section 16(1) in The Delhi Metro Airport Express Line, General Rules, 2010
(1)Cab Signals- (i) Train movements on running tracks shall normally be governed by the Automatic Train Protection system which displays to the Train operator in the operating console -(a)actual speed of the train;(b)the maximum permitted speed at each point of travel;(c)the distance the train is currently authorized to travel (where provided);(d)system alarms; and(e)Messages;(ii)if the target speed indication and the target distance indications, where provided, are greater than zero, the indication is referred to as "Proceed" indication;(iii)if either of these indications is "0", the indication is referred to as "Stop" indication;(iv)The train operator is authorised to drive his train up to the indicated speed as far as authority has been given for such purpose.
