I think Between Visakhapatnam - Guntur/Vijayawada
their are many options.
Starting From Shimadri, Vskp AC Weekly, Vskp Duronto, Janmabhoomi etc.
Logically speaking Mainly Guntur pax prefer new train to...
more... Tirupati or Hyderabad more then Visakhapatnam.
But Between Visakhapatnam - Ongole/Nellore don't get much options except daily Tirumala ЁЯдФ.
Daily Intercity connection is not available between Visakhapatnam - Ongole/Nellore.
UDAY extension till Ongole/ Nellore will have proper Intercity connection to Executive Capital!