Why New York Subway Lines Are Missing Countdown Clocks(theatlantic.com)
theatlantic.com
Why New York Subway Lines Are Missing Countdown Clocks
http://www.theatlantic.com/technology/archive/2015/11/why-dont-we-know-where-all-the-trains-are/415152/?single_page=true
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https://news.ycombinator.com/item?id=10566776