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India's longest rail tunnel completed in Uttarakhand

    A. Luthra
    By A. Luthra Replies (1)

    'It is a complex undertaking as it involves the parallel construction of two tunnels,'  Read more at: https://www.deccanherald.com/india/uttarakhand/indias-longest-rail-tunnel-completed-in-uttarakhand-3500682

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