Google Maps and transit stations
Image by Richard Masoner / Cyclelicious
Google Maps added train and other public transportation stops to select US locations a couple of weeks ago. This is the Caltrain Station at 4th & King in San Francisco, CA.
The "M" is supposed to be for subways, I think, but the only thing nearby is the Muni station across the street, and that one is above ground, though it does go underground. San Jose light trail stations are identified with the train logo.