LyrArc Article Gist
India China Border and rail connection $40 billion project Chengdu to Lhasa 2025. The infrastructure brings China greater access to the western region of China some of it from the occupation of Tibet in the 1950's that now makes up territory the size of 80% of the contiguous US. India is rapidly modernizing it's side of the border with tunnels and bridges. 

This situation is new. For most of history from 1000 to 1950's China had only a remote connection with the Tibetan and Indian border regions where nomadic tribes and Tibetans lived. Very few Chinese numbering by the hundreds or a few thousands may have visited the region as even under the British contacts were very limited with Tibet and border regions in the Himalayas. For China it is far from its major population centers in Beijing and Shanghai and Hong Kong, Shenzen. And it provides few advantages in spreading over a vast region that is remote and in high over 15,000 feet in the Tibetan and border regions. It is only the invasion of Korea and China by Japan in the close of the nineteenth and early part of the 20th century that has created the idea of having buffer regions that protect it from foreign powers. And this is what may happen over the next 50 years as the region goes back to what it was before the 1950's, but with modernization, as India does not seek to reach out beyond Himalayan borders into regions closer to China.