These streetcar lines were replaced with bus routes in the 1930s and 1940s. Before Broadway became one-way, the main bus routes along it were the New York City Omnibus Company's (NYCO) 6 (Broadway below Times Square), 7 (Broadway and Columbus Avenue), and 11 (Ninth and Amsterdam Avenues), and the Surface Transportation Corporation's M100 (Kingsbridge) and M104 (Broadway Branch). Additionally, the Fifth Avenue Coach Company's (FACCo) 4 and 5 used Broadway from 135th Street north to Washington Heights, and their 5 and 6 used Broadway between 57th Street and 72nd Street. With the implementation of one-way traffic, the northbound 6 and 7 were moved to Sixth Avenue.