In 2005, the State Government announced the line would be extended 5.5 kilometres to the southern suburb of Seaford.
The plan was cancelled in December 2007 after a study concluded that the extension could not be justified.
The government announced that it would retain the corridor to Aldinga for a possible extension further south in the future.
In July 2008, a feasibility study was commissioned by the government into extending the line.
This extension was given approval after the Federal Government announced a $291 million investment in the project as part of the 2009/10 Federal Budget.

Construction started in 2011 with the extension opening on 23 February 2014.
The extension included a new 1.2 kilometre elevated rail bridge over the Onkaparinga River, a rail bridge over Old Honeypot Drive, and new railway stations at Seaford Meadows and Seaford.
New road bridges were also constructed over the extension at Goldsmith Drive, Seaford Road and Lynton Terrace.
In 2005, the State Government announced the line would be extended 5.5 kilometres to the southern suburb of Seaford. The plan was cancelled in December 2007 after a study concluded that the extension could not be justified. The government announced that it would retain the corridor to Aldinga for a possible extension further south in the future. In July 2008, a feasibility study was commissioned by the government into extending the line. This extension was given approval after the Federal Government announced a $291 million investment in the project as part of the 2009/10 Federal Budget.
Construction started in 2011 with the extension opening on 23 February 2014. The extension included a new 1.2 kilometre elevated rail bridge over the Onkaparinga River, a rail bridge over Old Honeypot Drive, and new railway stations at Seaford Meadows and Seaford. New road bridges were also constructed over the extension at Goldsmith Drive, Seaford Road and Lynton Terrace.
Seaford railway line