According to the Washington Metropolitan Area Transit Authority, Green Line trains will run every 20 minutes from 10:00pm Friday, September 19 to system close Sunday evening.  Trains normally run every 12 minutes.

The delays are due to work being performed on a rail tie, fastener and insulator, along with construction on a test track for new 7000 series rail cars between Prince George’s Plaza and Greenbelt, according to WMATA.

Other lines will experience substantial delays as well, including the Orange Line, where trains will run every 24 minutes.  Check for a complete list of track work this weekend.

Metro says it is investing $5.5 billion on system improvements, which include new rail, ties, platforms, escalators, signals, lighting, communication systems, and more.