The new Potomac Yard Metro station that was set to open near the sprawling Amazon headquarters development in Alexandria, Virginia, next spring will be delayed by at least five months because of design flaws in a critical safety system, Metro announced Monday. The new Potomac Yard Metro station that was set to open near the sprawling Amazon headquarters development in Alexandria, Virginia, next spring will be delayed by at least five months because of design flaws in a critical safety system, Metro announced Monday. Construction on the Potomac Yard station, on Metro’s Blue and Yellow Lines, began in December 2019 and was expected to be completed by April 2022.