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Britannica Sources used in this answer

When did the Kochi Metro begin operating?

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Map of southern India highlighting the state of Keralam in orange along the southwestern coast, with its capital Thiruvananthapuram labeled. Surrounding countries and major bodies of water, including the Arabian Sea and Indian Ocean, are also shown for regional context.
Keralam

The Kochi Metro, which serves as the passenger subway system for the city of Kochi in Keralam, began its operations in 2017.1