Bilaspur-Leh will be the most challenging rail project in India ever: Desh Ratan Gupta, chief engineer Industry-The Economic Times — September 9, 2017 comments off “The Bilaspur-Leh project is the most challenging for the Indian Railways. Between Bilaspur and Leh, there are four Himalayan ranges unlike just one (Pir Panjal) in Udhampur project.”