There may be issues that go unannounced. Not sure if this was a regular thing, but I got a train from Grand Central a while back and the trains & platform were

There may be issues that go unannounced. Not sure if this was a regular thing, but I got a train from Grand Central a while back and the trains & platform were so packed I could only get on the 3rd or 4th train that came. I'm also not sure if all lines have real time info yet, my line only got it within the last 12 months, and when I played with their external API, the data was of dubious quality. I'm not sure how much lasting value this app really has, but that's probably why it is an incubator project, rather than part of Maps.