The transportation system of Georgia is a cooperation of complex systems of infrastructure comprising over 1,200 miles (1,900 km) of interstates and more than 120 airports and airbases serving a regional population of 59,425 people. Background History Mass Transit MARTA MARTA is composed of both heavy rail rapid transit and a bus transit system that operates primarily within the boundaries of Clayton, DeKalb, and Fulton counties. In addition to Atlanta itself, the transit agency serves the following incorporated places within these core counties: Alpharetta, Avondale Estates, Chamblee, Clarkston, College Park, Decatur, Doraville, Dunwoody, East Point, Fairburn, Forest Park, Hapeville, Jonesboro, Lithonia, Lovejoy, Morrow, Palmetto, Pine Hill, Riverdale, Roswell, Sandy Springs, Stone Mountain, and Union City. Outside of the immediate service area, MARTA also operates one bus route to Cobb County's Cumberland Boulevard Transfer Center. In 2015, MARTA resumed bus service to Clayton County after a referendum in which the county agreed to a 1% sales tax increase to fund MARTA's return to most of the county (Airport Station is located in Clayton County but is not easily accessible for non-airport patrons), which had been without public transit service since the closure of C-TRAN in 2010. Introducing some form of high-capacity transit service (MARTA heavy rail, commuter rail, light rail, or bus rapid transit) into Clayton County is currently being studied by MARTA. Rail Amtrak maintains two rail lines through Georgia, with the Crescent: Birmingham, Alabama to Greenville, South Carolina traveling through Atlanta, Gainesville, and Toccoa, and another line with the Silver Service: traveling from Charleston, South Carolina to Jacksonville, Florida, traveling through the two cities of Savannah and Jesup. Up to the late 1960s, Atlanta had been a passenger train hub, with trains (in addition to the present-day Crescent route) to Chicago and Florida at Terminal Station and Union Station. Major freight railroads in Georgia include CSX and Norfolk Southern Railway. Passenger service in Georgia is available on two Amtrak routes: the Crescent, which travels from New York to Washington, D.C., through North Georgia and Atlanta to New Orleans and the other, Silver Meteor / Silver Star, travels from New York to the Georgia coast and from there to Florida. The River Street Streetcar is a heritage streetcar line in Savannah. It began regular operation on February 11, 2009, and shuttles between seven stops along River Street, next to the Savannah River. The BeltLine is a former railway corridor around