Jump into Google maps and plots some directions in CA, FL, NV, TX, VA, OR, etc and Japan (complete list here) and you’ll see an option for public transportation. Google will show you various ways, if they exist, on how to travel to your destination. You can even input your departure/arrival time. I’d expect this feature to roll out geographically over the next year or so depending on goverment/transportation cooperation. Question is, when will this feature show up on the iPhone?
Official site here.
Google Transit Now on Google Maps [SearchEngineLand]