The Google Maps transit layer now includes WMATA rail lines, but not bus lines.
Google has shown transit in many other cities around the world for years, but its data has never been complete. Some transit agencies provide detailed information, and some don’t. So while all buses and trains in San Francisco are visible, New York only shows subway lines, and Philadelphia shows nothing at all.
Google added some WMATA information back in 2011, but as far as I can tell, the rail lines didn’t show up as a visible layer until recently.
Clearly there are still some issues with the layer, though. Unless there’s a 2nd Orange Line I don’t know about.
Cross-posted at BeyondDC.