High Quality Content by WIKIPEDIA articles! The Eighth Avenue Line (officially the Washington Heights, Eighth Avenue and Church Street Line, and commonly known as the A-C-E) is a rapid transit line in New York City, United States, and is part of the B Division of the New York City Subway. Opened in 1932, it was the first line of the Independent Subway System (IND), and the Eighth Avenue Subway name was also applied by New Yorkers to the entire IND system. Most of the line has four tracks, with one local and one express track in each direction, except for the extreme north and south ends, where only the two express tracks continue. The line is signaled as Line "A", with tracks A1, A3, A4, and A2 from west to east, running from approximately 800 at the south end to 1540 at the north end (measured in feet).