What ever may be the HQ.. Whole AP should get benefitted ..
So only I proposed hubs concept.
For the eg
Trains starting @ VSKP and towards BZA should be extended to PSA (Though not all atleast Tirumala, Link exp)
Trains...
more... starting @ VSKP and towards VZM should be extended to CCT/COA and Pitapuram - Kakinada line should be developed. (LTT, Bhagat-Ki-Koti exp)