With China building a rail link along the Sino-Indian border, Sikkim and Arunachal Pradesh are pushing the Centre for better connectivity. Here's why:
Conectivity has become important because of strategic defence needs. There are also economic reasons as trade through Nathu La has been resumed. Tourism too will get a boost.
Both states do not have an airport
They do not have even a kilometre of railway line
The road connectivity is very poor. Large parts of the two states are still non-motorable.