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Detailed explanation-1: -Namma Metro ("Our Metro” in Kannada), also known as Bengaluru Metro, is a rapid transit system serving the city of Bengaluru, India. Upon its inauguration, it became the first underground metro system in South India. Namma Metro has a mix of underground, at grade, and elevated stations.

Detailed explanation-2: -Kolkata Metro was the first Indian metro that started its journey in the year 1984 from Esplanade to Bhowanipur. It initially covered a distance of 3.4 KM. The Kolkata Metro is the first underground metro rail system in India.

Detailed explanation-3: -Kolkata (Calcutta), India First underground Metro railway in India.

Detailed explanation-4: -These are Kolkata, Delhi, Bengaluru (Namma), Gurugram (Rapid Metro), Mumbai, Jaipur, Chennai, Kochi, Lucknow, Hyderabad, Noida, Ahmedabad, and Nagpur. The metro systems in all these cities of India are not operated by the Indian Railways, except for Kolkata metro, which has its own zone within the Indian Railways.

Detailed explanation-5: -Yellow Line – Delhi Metro The 45 km long line mostly underground and also known for Chawri Bazar station, deepest station of the Delhi Metro 98 ft below ground level. Yellow Line has longest metro tunnel in India with total length of around 30-35 km (Not Sure) with 34 metro stations.