I was excited to check this out, but there seems to be a zoom limit, which makes this too difficult to try to use on a (small) phone.
I must be missing something, though, because all it will do is show a station label when I tap a station. I've tapped several stations but don't see anything else to interact with. How are you supposed to get it to show travel times? (Using Safari on iOS 10, if that makes a difference.)