services resumed on 1 December 2013. The completed project was opened by the South Australian Transport and Infrastructure Minister Tom Koutsantonis on 18 January 2014. Electric train services commenced in February 2014 after testing was completed on the line. At the time, only four A-City electric multiple units had entered service, so most services continued to be operated by 3000 class railcars. Seaford extension In 2005, the State Government announced the line would be extended 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 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. Future extension to Aldinga Beach In 2019, Renewal SA delivered a Draft Structure Plan of a 94 hectare area of land in Aldinga which is set to include a new school and a train station. Route The line runs south from Adelaide station paralleling the Belair line as far as Goodwood. It then branches off in a south-west direction through the suburbs of Edwardstown, Oaklands Park and Marion to the coast at Brighton, where it turns south towards Noarlunga Centre in the southern suburbs. The line was known as the Marino and Hallett Cove line when it finished at Hallett Cove. Most trains terminated at Marino, with only about a quarter going to Hallett Cove. Like the rest of the Adelaide network, the line is broad gauge. Dual gauge sleepers have been laid to allow for the line to be converted to standard gauge at a future date. The line is long and is the second longest of the Adelaide suburban railway lines. The line is double track throughout. The Australian Rail Track Corporation standard-gauge main line passes over the line just south of Goodwood