Devprayag – Tunnel T8 Nears Breakthrough, Set to Become India’s Longest Railway Tunnel

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n a groundbreaking development, Tunnel Boring Machines (TBMs) are being used for the first time in the Himalayas to construct Tunnel T8, part of the ambitious Rishikesh-Karnaprayag Rail Project. Spanning a massive 14,587 meters, Tunnel T8 is poised to become the longest railway tunnel in India. It stretches from the upcoming Devprayag Railway Station to Janasu Railway Station and is being built using a combination of Tunnel Boring Machine (TBM) and New Austrian Tunneling Method (NATM) technologies, enabling faster excavation and lining in the challenging Himalayan terrain.

The Rishikesh-Karnaprayag Rail Project is a 125.2 km broad-gauge line aimed at significantly improving connectivity in Uttarakhand. Two state-of-the-art Herrenknecht Hard Rock TBMs, named Shiv and Shakti, are being used by Larsen & Toubro (L&T) under Package 4 to bore through complex geological formations including quartzites, dolomites, phyllites, and seismically active zones. Each TBM has a diameter of 9.1 meters and is designed for single-shield hard rock tunneling.

News Station editor Siddharatha recently visited the site to review progress. A breakthrough is expected soon, marking a major milestone in India's infrastructure development and a leap forward in rail connectivity in the Himalayan region.
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