Accompanied by Chetan Kumar Shrivastava, General Manager of Northeast Frontier (NF) Railway, and Satish Kumar Pandey, General Manager/N. F. Railway/Construction, along with other senior railway and construction officials, Sinha meticulously reviewed the project's progress.
The length of Tunnel No. 12 is 1406 m located between Tarkhola and Shukia Khola in the Kalimpong district of West Bengal. The tunnel traverses through vulnerable and challenging geological conditions of the lesser Himalayan range, as per an official statement.