Agree with you.
This region in prevailed by elephants and the forest is so dense that it would require many trees to be downed.
Even in Dehradun city, there is very less space around the track.
I think this proposal should be dropped because it is a very costly deal and and it would harm biodiversity.
And...
more... if doubling of tracks takes place. Then, it would take min. 7 years(account. to condition of work which are in progress)