WMATA reported delays on the Red line earlier this morning due to a disruption at the Bethesda station. Metro station announcements said there had been a track malfunction, and that trains were single tracking between Friendship Heights and Medical Center. WAMU and WTOP are both reporting that smoke at the Bethesda station is the cause of the trouble—debris on the tracks was the apparent source of the smoke. Montgomery County officials told WTOP that…