Public Transit Stops Available on Google Maps

Google has recently added public transit stops to Google Maps. Now when you use Google Maps in major U.S. cities, public transit train stops are now marked directly on the map. This is a good intermediate step to having a full version of Google Transit for these cities. Google needs the cooperation of the transit agencies to set up Google Transit, but it is straightforward to simply add the stop locations to Google Maps.

So although you can't fully plan your trip with Google Transit, you can at least find the closest train stop to your destination.

I've confirmed train stops are marked for New York, Chicago, and Philadelphia. What other cities have been updated?