Credit: Metro's Red Line service is now single tracking between Judiciary Square and Farragut North stations after it was previously suspended Sunday night.

Red Line trains single tracking due to arcing insulator

Metro wants to deal with its ‘air traffic control’ problem

Metro lacks systemwide testing to combat root causes of smoke, fire incidents

Metro officials probe repeat radio problems after Red Line riders bail

Safety, service cuts before Metro’s board

Metro review finds power, fire problems exacerbated by lack of worker training