Red Line trains were single-tracking in the District on Monday after a track fire outside Ft. Totten, Metro said.

Shortly after 11:30 a.m., Metro announced it was suspending service between Fort Totten and Takoma stations following the fire outside Ft. Totten. The transit agency sent shuttle buses to ferry passengers between the two stations. Service was partially restored by about 12:15.

The cause of the fire was not immediately clear -- though it was raining Monday and moisture has been cited as a cause of Red Line fires in the past. A Metro spokesman did not provide an estimate on when Metro would fully restore service.

Separately, Metro briefly instituted single-tracking along the Blue Line after what it called a “medical emergency” between Pentagon City and Arlington Cemetery. Blue Line trains were no longer single-tracking by noon, the agency said.