Karachi is the only city in the world with a population over 20 million and no citywide rail-based public transport system — a few other megacities only have regional train networks, but all of them have plans to expand their networks. And while trains need not be the primary public transportation option in a metropolis, all similarly sized cities also have elaborate public bus networks, often complemented by other options such as trams, ferries and boats, and private hire transport options, including buses, taxis and........

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