Metro's lying signage

I take mass transit to work every day. Part of my trip involves taking Washington MetroRail. It's more expensive than it should be for the short distance I travel, and there are often random delays. This is aggravating, but those are the breaks.

What I don't like is the fact that the computer signage is frequently wrong. Not just off by a minute or so, but so far off that some trains don't seem to even exist! You may think that this is just an unfortunate system glitch, but this has now happened three times in the past 6 commuter-days I've traveled.