Nyc Subways Slowly Upgrading From 1930s-era Technology

VERENA DOBNIK Associated Press, San Diego Union-Tribune Nation
Sun, 12/21/2014 - 10:59am

New York City's subways — the nation's biggest mass transit network — serve more than 6 million daily riders who depend largely on a signal system that dates back to the Great Depression.

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Topics: york city great depression subways

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