What mode of transportation runs underground in many urban areas?

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TECHNOLOGY QUESTION #8382

What mode of transportation runs underground in many urban areas?

Metro

Explanation

An underground (metro) is an electric passenger railway in an urban area that operates underground in tunnels. Most metros are only underground in the city centre, and then resurface in the surburbs to run on ground-level tracks. More than 130 cities worldwide have a metro including London, New York, Paris, Moscow, Berlin, Stockholm and Copenhagen.

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Answer time 0s (0s). 68% have previously answered correct on this question. The question was created 2012-05-04.