From Nandyal Rly Stn get an Auto for Rs.10/- Per Head ( Sharing Basis) to Bus Stand from where You get buses to Pilgrimage Places as follows :
Mahanandi (16km) - Bus Frequency : 30min
Ahobilam (64km ) - You need to go to Allagadda ( 40km ) from there u need to get a bus to Ahobilam .
Nandyal to Allagadda...
more... Bus frequency : 10mins
Allagadda to Ahobilam Bus Frequency : 60mins
Yaganti ( 55km ) :
Nandyal to Banganapalli ( 42km) 15mins Frequency
Banganapalli to Yaganti : Pvt Transport usually Autos stand outside Bus Stand at Banaganapalli.