Actually its bit tough to identify in NDLS CNB section as numerous number of Raj/GR/Prem/Dur trains gets GZB P7s as their loco links...
For Example :-
A LGD WAP7 #30273 is spotted on RDS on Wednesday crossing the Asaoti station at 16:27:32 at a speed of 132 kph...
As we know that at that day only MAS Raj runs on that...
more... day which crosses Asaoti near about 16:25 and its regular loco link is LGD P7... So that will be the loco of MAS Raj