First of all you should check the arrival history of LTT Nizamuddin AC Express, it's not punctual at all plus the NTES data gets manipulated whenever a train crosses Bhandup while entering Mumbai so you should add 10-15 minutes more to the existing delay. Even Allahabad LTT Duronto faces the same issue.
The Problem for this train is congestion at it's terminals as well as Kalyan 🙏🙏.
I think it's better to make a slow time table and maintain punctuality there rather than making a fast time table that becomes difficult for this...
more... train to cover. This train is already at a disadvantage due to it's long route, if it's not able to maintain punctuality then this train would be a disaster especially when we consider that there are 2 Rajdhani Trains existing for the same place via much shorter route.
First let it run and maintain its schedule, if it's getting before time arrivals at intermediate Stations then only speed ups should be considered.
Slack should've been there from Kalyan to LTT for AC Express instead of Bhopal Bhusawal Section.