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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Onsu. August 7 – In Seoul, South Korea, the first section of Line 6 of the Seoul Metropolitan Subway is opened between Bonghwasan and Sangwolgok (4.2 km...
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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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