The Yellow Line was originally planned to follow a slightly different route in Virginia. The plan would have sent Yellow Line trains to Franconia–Springfield, with Blue Line trains serving Huntington. This was changed due to a shortage of rail cars at the time of the completion of the line to Huntington. Because fewer rail cars were required to operate Yellow Line service than would be required to run Blue Line service out to Huntington – due to the Yellow Line's shorter route – the line designations were switched. From 1999 to 2008, the Yellow Line operated to Franconia–Springfield on July 4, as part of Metro's special service pattern on that day.