The downtown transfer stations, however, were NOT built with knock-out panels. They were built as they are today.
The Red Line level at Metro Center opened in 1976. The Blue and Orange Line level opened the next year, 1977. Entrances on the north and south sides of the station were accessible from day one, even though no trains were serving the lower level.
L'Enfant Plaza's Blue and Orange level, the lower level, opened in 1977 as well. Six years before the upper level (Green and Yellow) opened in 1983.
Gallery Place was not open for opening day (Red Line trains went through without stopping), but was open later that year. The entire complex, including the northern (7th/H) entrance was open before the Green and Yellow Line lower level opened in 1983.
The other perpendicular transfer station, Fort Totten between the Red (upper) and Green (lower) Lines was NOT constructed as a unit. The Red Line level and mezzanine were constructed above a gap left for the Green (lower) level, but the lower level was not constructed until construction for the Fort Totten-Greenbelt segment commenced in the early 1990s. It opened in December 1993. The Red Level opened in 1978.
