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So awesome! I found that you can get the Metro's next train arrival times on your phone! It's exactly the same data you see on those electronic boards on the platform – I checked it for the Courthouse station, and saw that I had two minutes to make the train, and I ran down to the platform and just barely caught it.
It's extra nice that the page is intended to be displayed in a popup – so it's a tiny download.
1. Google “wmata <name of your stop>”
2.The second link (usually) goes to a small page showing the train arrival board. You can also find it on the station's page.
Like this: Clarendon
If you have an iPhone with the Jan08 update, add that sucker to your home screen!