BZA have sufficient pitlines-5(13,14,24,24,24) for maintaining extra trains but due to congestion of at BZA, BZA have less originating trains. There are many reasons like
1. Laziness of BZA div to run trains from home.
2. If train starts from BZA towards KMT after 20kms it enters into SC division doesnt caters home division or AP.
3. Congestion of PF's(1,4,5,6,7) and 2,3,8,9 PF's are...
more...

small and used only for MEMU/DEMU trains are kept free whole day with passenger trains. Now a days 10th PF is used for long distance after interlocking.
And not only Vijayawada cities like Tirunelveli, Guntur, Rajkot, Dhanbad, Solapur, Bhusaval having 2/2+ (24 coaches) pitlines but less originating trains and pitlines are used for maintaining passenger trains.

-
About intercity to Tirupati already Pinakini ki clone ga Tirupati ki oka intercity nadapamani demand undi.
-
Is Vijayawada is small city ?
No, Vijayawada is city with 14 lakhs population after merging of suburbans like Penamaluru, Kankipadu, Nunna, Gannavaram, Ibrahimpatnam, Rayanapadu, Gollapudi, Enikepadu, Prasadampadu, Yanamalukuduru, Kanuru, Ramavarapadu around 45 villages near Vijayawada increases a population of about 16-17 lakhs almost near to Visakhapatnam Population(anakapalli to bheemunipatnam). So think before saying BZA is a small city.
-
Direct ga trains vesina janalu ekaru ? Enduku yekaru yekutharu but depends on timings/route etc.
HWH humsafar is not a example for it because Humsafar is a flop concept in IR, Humsafar trains starting from Metropolitan cities does not getting demand.
-
After operations of SCoR, trains towards South definitely start from VSKP to cater coastal area upto GDR/TPTY and towards north start either at TPTY/BZA/GNT towards VSKP to cater same route.

Okasari e chart chudandi meke clarity vastundi, pitlines oka schedule.
For passing traina via BZA 10-15 mins is needed but for originating trains 30-45mins neededs and only 1-7PF's connected to Pitlines and 10PF's recently in that (1,4,5,6,7) are busy with upcoming downgoing trains.
...
NS/MTM/COA are terminals for BZA division not for BZA. For BZA they need to develop Gunadala for long distance trains....
more...

....
Delhi, Mumbai, Bengaluru, Chennai, Kolkata, Hyderabad, Pune, Ahmedabad only comes under Tier-1 (X) cities while other cities like Bhopal, Indore, Coimbatore, Kochi(Ernakulam), Hubballi are also comes under tier-2 even VSKP is also tier-2 then those are small cities? , IR not running any long trains from it ?
...
IR runns trains based on political options only (except Delhi, Mumbai, MAS/SBC/HYB/PUNE). Most of the trains in IR originating from Small Stations/Terminals only with connecting big cities on that route.
---
BZA to TPTY ticket dorakatam easy avachu kani ade SBC/MUMBAI/PUNE/North India/Patna/Jaipur side ithey chala kastam kada.

Forgot about BZA, can you tell that except Metropolitan cities like MAS/SBC/HYB etc any city in IR can fill full train with only originating station. If they fill then there are only duronto trains in IR.
If we consider BZA,
GDR-TEL, GTL-GNT, CCT/MTM-GDV any section passengers can fill half more than train. Dont think that Bza means only Vijayawada;
Guntur, Prakasam, Krishna,...
more...

West Godavari People depends on BZA station.