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.
From The Associated Press
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Nyc Subways Slowly pgrading from 1930s-Era Technology
By The Associated Press
December 22, 2014
![[article image]](https://cacm.acm.org/system/assets/0001/8289/122214.ap.interlocking_switch_and_control_board.large.jpg?1476779499&1419261122 "Subway interlocking switch and signal control board")
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