Updated post at 8:42 a.m.

Normal service has resumed on the Blue, Yellow and Green lines.

Original post at 8:08 a.m.

Riders should expect delays on the Blue, Yellow and Green lines during the Friday morning commute.

Blue and Yellow lines are single tracking between Pentagon City and Arlington Cemetery stations because of a track problem at Pentagon station. Metro said delays are in both directions.

Metro also said that riders on the Green Line should expect delays because of the same track problem.

Here are some pictures of the delays and thoughts from riders on Twitter:

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