How about this overnight+ICE train between Manuguru and Tirupati....
This train goes via Bhadrachalam Road, Khammam, Vijayawada, New Guntur, Tenali, Gudur, Tirupati, Katpadi, Salem and Erode....
The train departs from Manuguru at 19:15 hrs. and arrives at Coimbatore at 15:00 hrs.