MPS of 02621/TN in the stretch (as observed) ;
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1) MAS GDR - 110 kph.
2) GDR BZA - 110 kph.
3) BZA WL - 120 kph.
4)...
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WL BPQ - 120 kph.
5) BPQ NGP - 110 kph.
6) NGP ET - 110 kph.
7) ET BINA - 110 kph.
8) BINA PWL - 110 kph.
9) PWL NDLS - 110 kph.

Summary of 02621 travel :-
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(1). Cleanliness and Maintenance :-
Well, the rake is top class, as it is hardly 4 months old almost all are Oct 2020 made, but in the entire journey it was maintained well. Right from start, Tharun and Sons (company) the OBHS of this train maintained the rake neat and clean, with sweeping, then mopping with floor cleaners...
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after 2 stations departure they clean (for e.g. after WL, NGP, BPL), in AC only the mopping is done. And once in the journey, they wipe the window from outside that is during middle of the journey i.e. at NGP they did it. The choking of washbasin was very less , I hardly saw 1-3 basin choked, that was cleared after few hours, that is mostly in SLs.
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(2). Food and Pantry :-
About the eatables available inside the train are quite less, tea and coffee is served regularly. I heard someone buying coffee for ₹30, much higher in price i think. They will take take order for dinner and lunch (thali(s) around ₹120 for veg), but for breakfast only bread omelette avbl. And snacks only samosa available in SLs. Outside the train, in station PFs you will get everything now, in Bhopal dhokla and aalo bonda was looking good.
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(3). LHB comfort feel :-
Coaches are new, and comfort is so good. In SL , the 120 speed is smooth, looks like only in 100-105 it is moving.
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(4). TimeTable and Punctuality :-
Ahhhh... , this TT is not for suitable for the original nature of TN. The timetable is only good till BPQ, can say till NGP, it is good. But after that from NGP to NDLS, not so upto the mark.
- MAS BZA;
Did a great run till Sullurpeta, then after that maybe due to some track work and all, again and again slowed down, this continued till Odur. Then after Odur, stopped for 10mins. Then at Gudur that normal stoppage of few seconds for every non-stop train there for caution order H/O. Maybe becuse of speed upgradation, major track works are going on. Then, Gudur to Vijayawada run, was so good, can feel many TSRs/PSRs are improved.
- BZA WL;
Incredible run here, was trailing AP a bit from Madhira to Khammam, then OT AP at Khammam, did Vijayawada to Warangal in 2hr 34mins. Similar to Rajdhani run.
- WL BPQ;
A mixed experience, 120 was good, but 4-5 station was skip through loop. Did good run here.
- BPQ NGP;
Not at all a good run, slow station skips at Tadali, Majri, Warora, Bhandak and and stopped at Yenor, Sonegaon, Bhugaon for few mins. It touched 110 max only after Seloo Road.
- NGP ET;
Same like Balharshah Nagpur section, ups and down, Pandhurna was crossed around 1545 only. Chichonda to Kiratgarh (till ET Outer) run was good, halted for some 20 mins at ET Outer.
- ET BPL:
Did a very good run with its mps of 110. Did hit BPL before time by 12mins.
- BPL JHS;
After Bhopal, instantly after 1.5 kms , picked up the pace, did extremely good till Bijauli with 110, AP OT TN before Bijauli, then TN looped Bijauli around 2348 for 02691 OT. Almost 50mins BT there.
- JHS AGC;
Don't know much, as I fell asleep. It did arrive AGC some before time.
- AGC NZM NDLS;
From Agra to Mathura, took 45mins, not so good run. Vrindavan Road, Ajhai mps skip, then crossed Chhata via loop, then Kosi Kalan outer it was stopped, and then cautiously skipped it. Next station itself, at Hodal, looped for OT by 08215 DURG UHP, because of TT. Then till Palwal did good. Palwal skip low speed, Asaoti mps skip, Faridabad also mps skip, from there crawl to enter NZM only some 2-5mins BT. Then NDLS arrived 0738.
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Conclusion :-

"MODIFY THE TT by reducing the travel time by giving 130 MPS in WCR NCR NR"

or

Revert the 12621 TT to this with 110 MPS only