Sefton station opened on 19 October 1924 when the
Lidcombe to
Regents Park line was extended to
Cabramatta to become part of the
Main Southern railway line. The station building is of a characteristic standard design from the 1920s and 1930s. The station was further expanded in the following years, with booking and parcels offices installed on the footbridge in 1928. The station has undergone changes over the years as the importance of the station decreased and its urban context changed. The buildings on the footbridge were removed. Flower boxes, hedges and trees on the platform were removed. An awning was erected at the end of the 20th century to connect the footbridge landing with the main station building. In 2009, as part of the construction of the
Southern Sydney Freight Line, major works were carried out in and around the station, including reconstruction of part of the footbridge, and the installation of lifts. The Southern Sydney Freight Line works also added an additional track to the south side of the existing station, but with no platform. The station is heritage-listed in the state heritage register for
New South Wales. ==Platforms and services==