I was asking this because even Guntur - Secunderabad section is just similar to Kacheguda - Dhone section. And the train Vijayawada - Lingampalli Intercity Express travels about 281 km in 3:55 minutes. Also SECUNDERABAD - VISHAKHAPATTANAM AC DURONTO travels via Guntur. Where as Kacheguda- Kurnool City is just 236 km and the fastest train takes 4 hours in this section. Atleast one fast train which could take around 3 - 3.5 hours must have been in this section as presently people prefer road route to Hyderabad as it takes just 3 - 3.5 hours where as a train takes 4-5 hours.
And as far as I have heard Vijayawada - Lingampalli is a train with full occupancy especially during weekends.