(Update at 11:35 a.m.) A burning track insulator sent MCFRS units scrambling on Thursday morning to the Metro Red Line tunnel below Bethesda.
According to scanner traffic, the spot of the reported smoke and fire was in the tunnel between the Medical Center and Bethesda stations, near an emergency Metro exit at 8001 Wisconsin Ave.
MCFRS later confirmed through Metro that the problem was from “a possible overheated or burning insulator on track,” according to MCFRS spokesperson Pete Piringer. Piringer also said the problem was under control.
Trains are single tracking between Medical Center and Friendship Heights due to the problem, according to Metro. There are delays in both directions.
Firefighters were on the scene at the Medical Center and Bethesda stations, as well as the emergency exit on the north side of downtown Bethesda.