The Green Line is a 28.6-mile (46.0 km) light rail line in Dallas USA operated by the Dallas Area Rapid Transit authority (DART). The US$1.7 billion project opened in phases starting in 2009. It operates in addition to the Blue Red and Orange lines.It began operation on September 14 2009 with a route from downtown Dallas southeast to Fair Park; this short route was scheduled to open in time to service the 2009 State Fair of Texas.