On this day in 1977, the Metro system introduced the second of its five color lines ... The Blue Line opened between National Airport and Stadium-Armory --- Making Metro Center a true transfer station and introducing all of us to Farecard Machines - and the state of Virginia -- All of the cars in use were the 1000 Series Rohr Cars using the original Roll Signs (as seen above) --- The next segment to open wasn't until February 1978 -- and at that time, Maryland finally had a station to call its own....