#wmata is single-tracking @ Rosslyn via the lower level due to a signal problem affecting a switch near the upper-level platform.
https://twitter.com/Metrorailinfo/status/1358198460550287362
Well, folks, we've got delays. A #wmata rail supervisor is on scene and will be manually throwing the switch which trains cross over before arriving at Rosslyn towards DC. Until that happens, we're single-tracking around with 10+ minute holds. 
#wmata has ended single-tracking @ Rosslyn (all trains on their normal platforms). ATC personnel are on scene to set routes so trains can proceed w/o significant delays.
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