Combined with topic of trains, this reminds me of the famous movie Dil Se with the Chaiyya Chaiyya song on the roof of the steam train - itself in the SW, but of which the core plot was also about an rebellion in Assam... i.e. it reminds that this problem is older than current government ...
But maybe they will be motivated to catch up, as China will soon have a direct railway from Sichuan to the frontier of Arunachal...