For DBRT Rajdhanis, IR should reduce the running expenses by the following means :-
1) Run these Rajdhanis with 3 phase locos (on electrified routes). Paisa vasool! 3 phase locos can make use of regenerative braking and save electricity.
2) Scrap political stoppages (MP/MLA stoppages). A stop costs IR Rs. 8000 (according to an Indian Express article). If the revenue earned is less than 10000 (For Rajdhanis), scrap them.
Simple...
more... measures can minimize running expenses easily.