The Broadway Line is a surface transit line in Manhattan, New York City, running mainly along 42nd Street and Broadway from Murray Hill to Harlem. Formerly a streetcar line operated by the Third Avenue Railway, it is now the M104 bus route, part of MTA Regional Bus Operations and operated by the Manhattan and Bronx Surface Transit Operating Authority, a subsidiary of the Metropolitan Transportation Authority, under the New York City Transit brand. This bus route no longer runs along the entire route of the former streetcar.