The Eighth Avenue Line is a public transit line in Manhattan, New York City, running mostly along Eighth Avenue from Lower Manhattan to Harlem. Originally a streetcar line, it is now the M10 bus route and the M20 bus route, operated by the New York City Transit Authority. The M10 bus now only runs north of 57th Street (near Columbus Circle), and the M20 runs south of 66th Street. The whole line was a single route, the M10, until 2000 when the M20 was created. Route description The M10 and M20 bus routes serve the northern and southern halves of the Eighth Avenue corridor, respectively. The routes intersect in Upper Midtown Manhattan, between Lincoln Center and Columbus Circle. Until 2000, the two routes were a single M10 route, running between Harlem and Lower Manhattan. M10 The M10 bus begins in Harlem at Frederick Douglass Boulevard (Eighth Avenue) roughly where 158th Street would be located, on the east side of the Polo Grounds Towers housing complex. There is no actual intersection with 158th Street at this point. The route travels south on Frederick Douglass Boulevard, which becomes Central Park West at West 110th Street and Frederick Douglass Circle. At West 63rd Street in Lincoln Center, southbound buses turn west, then turn south on Broadway, terminating at 57th Street and Broadway just south of Columbus Circle. Northbound buses travel along the entire length of Eighth Avenue towards Harlem. Prior to 2010, the M10 continued south to Penn Station at 34th Street. M20 The M20 begins service at Broadway and West 63rd Street in Lincoln Center, at Dante Park. Southbound, the route travels through Columbus Circle, east along 59th Street, and south along Seventh Avenue, which becomes Seventh Avenue South and then Varick Street. At the end of Varick Street in Tribeca, the M20 runs south on West Broadway, then west along Chambers Street past West Street into Battery Park City. The route then travels along North End Avenue, Vesey Street, a short stretch of West Street, South End Avenue, Battery Place, and State Street. The route terminates at Whitehall Street along the Staten Island Ferry Whitehall Terminal bus loop. Northbound M20 buses follow essentially the same route through Battery Park City, except using Murray Street instead of Vesey Street. At Chambers Street and West Street, the route turns north onto West Street, east on Harrison Street, then north onto Hudson Street. At