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Delhi Metro Rail Corporation Metro Phase 4 TBM Lowering
Delhi Metro Rail Corporation
Image: Delhi Metro Rail Corporation press release on 22 October 2020.
http://delhimetrorail.com/press_reldetails.aspx?id=omhzSqBuxs4lldMetro Phase 4 TBM Lowering.
cover tunnel photo by: Matt Brown from London, England / CC BY
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