This is world's longest Metro network with 508 stations, 20 lines, 10 million daily passengers, not Delhi, London, New York, it is located in...

This is world's longest Metro network with 508 stations, 20 lines, 10 million daily passengers, not Delhi, London, New York, it is located in...

DNA

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It is also one of the most high-tech metro systems in the world. Passengers can use mobile apps to check train timings, buy tickets with QR codes, and even access free WiFi in many stations.

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