Janata or Premium both are equally important to Mumbai.
Here you can see my slightly delayed Premium stopped at BCT outer/Mahalaxmi for ontime departing BCT FZR Janta Express.
There are many instances of non-sf trains are given priority over newer ACSF trains.
It is because they are senior n some of which are mentioned below:-
1)...
more... CSTM-CAPE Jayanti Janata KYN CAM2, GOOTY WDM3A, ED WAP4
2) BCT-FZR Janata GZB P5
3) HWH-ASR Mail GZB P7
4) Jhelum Exp GZB P7
5) ASR-CSTM EXP TKD WDP4/B/D n GZB P1/5/7
etc