In fact all new lines should be constructed as Double, it'd lead to economies in cost of construction.
Otherwise future mein doubling karne se again more time will be taken as well as cost would increase due to inflation.
Yeh sab pehle hi demand ko dhyaan mein rakhte hue karna chahiye tha, now after connection to Srinagar this route will see more traffic and Government will again sanction money for Doubling project. What a severe lack of planning.