Just board Kondaveedu express,Prashanti or Weekly Garibrath reach to Nandyal and book a retiring room in railway station with ur pnrnumber costs 150/- for AC &70/- for Non AC.Take rest and visit Mahanandi which is just 12kms from Nandyal town u will find a bus for every 20 minutes from Nandyal Bustand.After Mahanandi,u may leave to Srisailam to visit Mallikarjuna Temple.Every hour u will find a bus to Srisailam from Nandyal Busstand.Just 2.5 hours journey from Nandyal.Come back to Nandyal and visit Ahobilam,Yaganti,Kotturu Temple even Nava Nandis in Nandyala town itself and enjoy return journey with anyone of the above listed trains..