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If they were not underground they would be called a railway. they are put underground because the railways that run on the surface use up large tracts of valuable land. by putting them underground the land can be used for buildings.

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14y ago
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13y ago

The prefix sub- means below, so the subway is a way to get around underground.

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12y ago

Because it is less money though more clasterfobic..... good question

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Q: Why is a subway underground?
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