| Good quiz, but could you clarify what you mean by "metro"? For example, NYC had mass transit on rails in the city as early as 1863, then the elevated lines, and then the subway. And parts of the elevated lines are still in use in the system. Tünnel in Istanbul is indeed still an operating underground rail system. And there are also light rail and other systems in Istanbul. Boston still uses above and below ground streetcars running on lines that began in the 1850s. And many US systems use Metro to mean all mass transit operated by a central agency. |
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