Passengers board subway trains at the Naval Yard-Ballpark Metro Station, Thursday, Feb. 8, 2018, part of the public transit network for Washington. (AP Photo/Pablo Martinez Monsivais)

Updated at 8:15 a.m.

Trains on Metro’s Blue, Green and Yellow lines are no longer sharing a track after an earlier incident. But there are still delays for riders in both directions of the three lines.

There had been smoke at the Gallery Place stop. Metro officials said an “arcing stud bolt” caused the smoke.

Electrical arcing incidents on the rails can cause track fires.

Original post at 7:45 a.m.

Metro riders should expect delays on three rail lines for Friday morning.

Trains are bypassing the Gallery Place stop due to “fire department activity,” Metro said in a Twitter post. That is impacting the Green, Yellow and Red lines. On the Blue Line, trains are sharing a track between the Pentagon City and Arlington Cemetery stations.

On social media, there were pictures of smoke at the Gallery Place stop.