Narayanadri will be madfe to arrive right time because it has to undergo primary maintainance at TPTY where as Venkatadri and Padmavati doesnot require the same as they will undergo maintainance at SC and KCG ...
and coming to preference in return direction, people still prefer Narayanadri over Padmavati as it depart at 6:25 unlines Padmavati which departs at 5 from TPTY...