What is the largest metro system in the world?
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# Metrosystem
What is the most expensive metro system in the world?
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What is the second longest metro in the world?
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Is there a metro train in Vietnam?
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Which is the best metro system in Europe?
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What is the busiest metro system in the world?
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Which country has the longest metro system?
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Which city has the largest metro system by route length?
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Which is the longest driverless metro system in the world?
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Is there a driverless metro in India?
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