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How Madrid built its metro cheaply : In 1995, the Madrid Metro was 71 miles (114 kilometers) long. That would make it the 51st longest metro in the world today, reasonable considering Madrid is the 57th largest city in the world by population. Yet 1995 was the beginning of a revolutionary building spree. Over the course of the next 12 years, the metro grew by 126 miles (203 kilometers), nearly…
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