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Associated Press
In this Dec. 16, 2014 photo, Wynton Habersham, the New York Metropolitan Transit Authority's chief electrical officer, left, leads a tour of the subway system's computerized digital interlocking switch and relay technology. Transit officials are replacing the 1930s manual signal system with 21st century digital technology that will allow more trains to travel closer together and a growing ridership to move around the city faster. (AP Photo/Bebeto Matthews)

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