In this video, Doubling works happening between Dharmavaram to Penukonda via Nagasamudram is covered.On board Jaipur - Mysore Expresss powered by WAP7 .There are 2 railway lines from Dharmavaram to penukonda
1) Via Puttaparthi
2) Via Nagasamudram .
Doubling of Railway line via Puttaparthi is difficult as it involves a tunnel too.