Much of the technology in the New York subway system hasn't been updated in over 100 years

From the looks of straphangers during rush hour, with their headphones, smartphones, and e-readers, it would be easy to miss how old the New York City subway system is. But every day, hundreds of trains run through the largest subway network in the world on century-old technology. When things go wrong — as they have been doing more and more often — the delays pile up.
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