3:30 P.M. Update:

Metro officials are reporting that normal service has resumed on the Yellow and Green lines, but we’d liked to hear what you’re seeing. Tweet us @drgridlock or post a comment below.

2:54 P.M. Update:

Trains are no longer single-tracking, but residual delays remain in both directions on the Green and Yellow lines.

Original Post:

Trains are single-tracking on the Green and Yellow Lines between Mt. Vernon Square and L’Enfant Plaza due to a track problem near L’Enfant.

The track problem has to do with an arcing bolt, and trains are single-tracking while crews remove this bolt, according to Metro. The transit agency estimates that the delays could last until 2:45 or 3 p.m.

The District's Fire and EMS Department responded due to a report of smoke in the tunnels, but there was no fire.