I was thinking all silver line trains are actually running Ashburn - Largo for testing just passengers aren't allowed to ride past Wiehle and all signage should be reading Wiehle for west bound trains. I guess having all trains run the full route doesn't really make sense given the lack of trains.

Hmm, I just looked at Metro's online map and apparently Phase II of the Silver line is now colored white on this map and the Phase II stations are appearing on the live map (though no trains are showing up in that section).