Rail service between Metro's Takoma and Fort Totten stations on the Red Line has been suspended today.
The Takoma station will be closed until 7 p.m. Saturday while investigators return to the scene of last month's deadly Metro crash and focus in on a malfunctioning circuit that continues to be a problem.
The circuit was supposed to stop the Red Line train that crashed, killing nine people on June 22. The problem circuit was replaced, but still isn't working.
Metro and National Transportation Safety Board officials say they don't know what the problem is and "it's going to take us a little while to get it worked out."
NTSB investigators will be conducting tests on the tracks between the Takoma and Fort Totten stations throughout the day.
While the Takoma Metrorail station is closed, the Red Line will be divided into two segments, with trains running between the Glenmont and Silver Spring Metrorail stations, and between the Fort Totten and Shady Grove Metrorail stations. Shuttle buses will take riders around the accident investigation work, and make stops at the Fort Totten, Takoma and Silver Spring Metrorail stations.
Meanwhile, Metro says all Red, Orange, Blue and Yellow Line customers should add 30 minutes of time this weekend to their trips for track maintenance on those lines.
In addition, Blue Line trains will not service the Braddock Road Metrorail station.