Don't know what your specific needs are, but I did a quick search and came up with London Transport Live (http://www.androidzoom.com/android_applications/transp

Don't know what your specific needs are, but I did a quick search and came up with London Transport Live (http://www.androidzoom.com/android_applications/transportation/london-transport-live_bnnzt.html http://www.androidzoom.com/android_applications/transportati...), which from a quick play seems to do what I'd expect a transport app to do. I know that the specific app isn't your point - it's more about the general question of discoverability, but I rarely find too much difficulty finding at least one reasonable example of the kind of app I'm searchig for.