If the padmavati exp is made daily from 5 days then they I'll be separate rake for train via DMM pakala and that train frequency can be increased to 3 days. Though they are end to end the bi weekly train take more time to reach tirupati.in South SCR SWR SR the road lenths are shorter by 50-100 km in many sectors and this give edge to road transport. And with 4 laning trains should compete with personal cars too apart from buses. If a family of 4-6 people are travelling now a days they are using their cars for journeys 300-600 km who are all 2AC and 3 AC travellers.