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Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by krallja on Tuesday February 25, 2014 @01:55PM (#7299604)
The two passengers are going in opposite directions, so when would they ever have a chance to switch passes?

Are they supposed to get off their trains and meet each other on the platform, then wait for another train? Sounds like a stupid amount of work to steal 85 cents.

Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by Aloisius on Tuesday February 25, 2014 @02:10PM (#7299714)
The article is wrong. The two people are going the same direction on a Richmond-bound train which travels from Milbrae through Glen Park to Embarcadero and onto Berkeley.

There is also an example of doing the same thing on DC's Metrorail.

Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by jaredsohn on Tuesday February 25, 2014 @01:56PM (#7299622)
I was confused when I read that at first, too. The second person is coming from the opposite direction, which means they are already on the train when you get on.