In addition to the Jammu - Udhampur - Srinagar - Baramula Kashmir Rail Link that is in advanced stages of construction and partially in service, likely to be inaugurated for full service along its entire length in 2020, IR has been surveying four other rail links up into the Himalayas. Brief description of them appears in this article from 2014:
What is new is that these projects have now been fully sanctioned with promise of full funding over many years from the Government of India and from the Ministry of Defense.
Of these of particular interest is the proposed line from Bilaspur to Leh via Manali, Keylong, Baralachla, Sarchu, Pang, Lachlungla, Upshi. It will rise to an altitude of over 11,000' and will involve tunnels that are 20 to 30 miles long. I have traveled roughly that route by road, and ir is truly spectacular. It would be interesting to watch how it goes.