Mar 10 2021 (16:44)
This process blocks mainline for good 30 minutes by a freight , so is that feasible ?
Also the elongated halt at GDYA is due to OT of AP exp

Mar 10 2021 (18:25)
Just "Just imagine DNR-SC halts MJY (Technically) to detach Braker & again halts BZU (Commercially) to block Mainline twice!! twice!!"
Freight "Freight cant block mainline as Attachment will happen only if Freight awaits Preceding Freight Bankers Attachment Clearance at MRY MRY"

Mar 10 2021 (23:39)
If most trains halt DHQ/MJY then its rare for train banked till BZU & if happens, Banker must return instantly citing parking issue at BZU!!
There is no much difference in Elevation & Depression run time & if any train get Banker Attach/Detach, it must add 40-50 Mins of Banker Attach-Detach (as per your logic) but none displayed this huge Banker TAT in run-time!!

Mar 10 2021 (23:38)
If most trains halt at DHQ/MJY GDYA/DHQ/MJY/BZU its too rare for train to banked come till with Banker they if happens, Banker must return instantly citing parking issue at BZU!!
Freight will not stop for banker attachment @ BZU Loop (not mainline) but signal clearance coz Freight Block at MRY (but at Loop not Mainline)
If Detached detached was could about be to held move for to a MRY while just before letting trolling Rake/Banker clashing trolled schedule by of dual M/E/Freight run!! (too rare although) & can be attached citing Signal Clearance!!