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features of the Project. Lucknow Metro Rail Corporation. [2017-09-19]. （原始内容存档于2017-12-01）. Singh, Priyanka. Lucknow Metro achieves maximum speed certificate
Metro Railway Kolkata / Indian Railways Portal. www.mtp.indianrailways.gov.in. [2019-12-30]. （原始内容存档于2013-08-19）. History of Kolkata Metro Rail Corporation