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Initally, Kolkata Metro sustains only one corridor named as North-South metro which was first operational in 24 october, 1984. After the proposal of other corridors East-West Corridors construction work started 2009 and it will be operation in 2018. the corridor 1 or Line 1 has an aggregate length of 27 kilometers (17 mi) serving 24 stations of which 15 are underground. It has a blend of lifted, ground-level and underground lines and uses five and a half feet (1676 milimetres) of Indian gage, an expansive gage moving stock.
It was the main underground railroad to be implicit India, with the primary trains running in October 1984, and the full extend that had been at first arranged was finished and operation of metro started in February 1995. On 28 December 2010, it turned into the seventeenth zone of the Indian Railways. The New Delhi Metro, which was opened in early 2002, is the second such urban metro rail system in India. It had profited from the mastery picked up amid the Kolkata metro development.
In being the nation’s first metro and developed as a totally indigenous procedure, the Kolkata Metro was all the more an experimentation undertaking, as opposed to the Delhi Metro, which has likewise seen the contribution of various universal experts. Therefore, it took about 23 years to totally build a 17 km underground railroad.