The ALCO Century Series locomotives were a line of road switcher locomotives produced by Alco, the Montreal Locomotive Works and AE Goodwin under license in Australia. Production of the Century Series began in 1963 and ended in 1972. MLW and Goodwin continued to build Century locomotives after Alco ended locomotive production and shut down in early 1969. A total of 841 locomotives, in eleven variants, were produced over the ten years of production.