Chennai Metro Rail Ltd (CMRL) has opened technical bids and 4 firms qualified according to MetroRailNews news.
4 Firms will be competing to get to build 42 kilometers long tunnels for Chennai Metro Phase 2. They are named as GULERMAK, Larsen & Toubro Limited, Shanghai Tunnel Engineering Co. and Tata projects.
MetroRailNews gives the details:
https://www.metrorailnews.in/four-firms-participate-in-chennai-metro-phase-2-tunnel-works/Chennai
(map by Chennai Metro Rail Limited)
"The Metro Rail Guy" always is good source for Chennai Metro Phase 2
https://themetrorailguy.com/chennai-metro-phase-2-information-map/
118.9 km Chennai Metro Phase 2 with 3 new lines was approved by the Tamil Nadu govt in 2019 at a cost of Rs. 69,180 cr. Construction on 52 km begins in 2021.
Official Chennai Metro Rail Limited Phase II information. Most reliable.
Larsen & Toubro Limited is the lowest bidder beating GULERMAK, Shanghai Tunnel Engineering Co. and Tata projects.
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https://www.metrorailnews.in/four-firms-participate-in-chennai-metro-phase-2-tunnel-works/Chennai