MTA releases limited app for RealTime subway tracking
secondavenuesagas.comHave to say; having just downloaded the app (https://itunes.apple.com/us/app/mta-subway-time/id561507659?...) it's fairly disappointing UX; the real draw is the data, which (although limited to just a few lines) seems to be accurate. Hopefully the plan is to open up this data to third party developers sometime soon.
The data is already available: http://datamine.mta.info/