(MENAFN- Saudi Press Agency) New York City's subways, the biggest U.S. mass transit network, serve more than 6 million daily riders who depend largely on a signal system that dates back to the Great Depression of the 1930s, AP reported.
Antiquated electro-mechanics with thousands of moving parts are still critical to operations. Dispatchers still monitor most trains from 24-hour underground 'towers,' and they still put pencil to paper to track their progress.
That eight-decade-old system is slowly being replaced by 21st-century digital technology that allows up to twice as many trains to safely travel closer together. But there's a big caveat: It could take at least 20 years for the city's 700 miles (1,127 kilometers) of tracks to be fully computerized.
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