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New York will let you pay for subway rides with your phone... in 2021
http://mashable.com/2016/04/13/nyc-metrocard-mobile-payments/#mygurDjyDuqOsnip
The rumble of a train coming down the tracks to the station fills the underground air, but the turnstile is still 30 feet away. It'll be at least another 15 minutes until the next northbound R comes rolling through. As the rumbles turns to screeching brakes, the yellow MetroCard slashes forward.
"PLEASE SWIPE AGAIN"
The train stops and the doors open.
"PLEASE SWIPE AGAIN"
snip