If you're willing to fork out $4 for up to the second tracking of train arrivals, iBART LIVE is worth the investment. I've had iBART (the free version) for quite some time and found it very helpful, however, to find out about delays, I needed to open up the "advisories" notification and read about them.
Well, with iBART LIVE, you will have the same info as the scrolling ticker that we see on the platform right on your iPhone. Very convenient for someone like me who does not have the patience to wait around on the platform for delayed trains...I do wait, but you'll read about it for sure here or on Twitter!
Why $4 though?? That's a bit much for an iPhone app in my opinion. Can someone explain?