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…