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> I’m not sure I’ve seen another transit card around the world that works across the whole country.

HongKong but it is a small city. The card also functions in Macau.

As is Singapore's EZ-Link. In fact, you can buy a EZ-Link SINO Visitor Pass, which is both a Singapore EZ-Link card and a Guangdong Lingnan card... I know Hong Kong issues a few cards like this for cities across the border in the mainland.

Still, not nearly as impressive as the Japanese system.

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