The DART Rail System is one of the longest light rail systems in the United States at 93 miles. The system has four lines – Red, Blue, Green, and Orange – with all lines passing through downtown Dallas. DART Rail serves 65 stations in nine cities located in downtown Dallas, South Dallas, South Oak Cliff, West Oak Cliff, the North Central Expressway Corridor to North Dallas, Richardson, and Plano, the Northeast Corridor to Garland and Rowlett, the Northwest Corridor to Farmers Branch and Carrollton, the Southeast Corridor to Pleasant Grove and the Northwest Corridor to Irving and DFW Airport.