 If it's summer, there must be track work on Metro. Clues will be installing radio, fiber, and cables during late-night track work. Later, actually starting on Monday, Metro's Blue Line will start operating between Franconia-Springfield and New Carrollton instead of downtown Largo on select nights after 10 p.m. The plan is to avoid single tracking, allowing the Blue Line to run every 15 minutes as normal. Silver Line trains will still operate between Ashburn and downtown Largo, but single tracking between Stadium Armory and Addison Road after 10 p.m.