within a single tunnel. "Urban Rail Transport SA :METRO Line 1". Retrieved 30 September 2014. "Metro to bridge Delhi-Gurgaon divide today". The Hindu....
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List of longest tunnels (category CS1 German-language sources (de))
from the original on 22 March 2012. Retrieved 1 February 2016. "Tras 11 años de construcción, inauguran el Túnel Emisor Oriente". 23 December 2019. Archived...
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(2014-07-22). "Guadarrama Tunnel (Segovia, 2007) | Structurae". En.structurae.de. Retrieved 2016-02-01. {{cite web}}: |author= has generic name (help) "Awards:...
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