due to a tram operating in the same intended purpose. Rail While Adelaide's suburban passenger-rail network does not suffer the chronic delays of its inter-state counterparts, it is comparatively under-developed; Adelaide is the last mainland capital with a non-electric network, with a 10-year $2 billion transport program commencing in 2008–09 to rebuild and electrify the network. However, only the Seaford and Tonsley lines were electrified, being completed in 2014. After being announced and canceled multiple times, the electrification of the full Gawler line is due for completion in late 2020. Adelaide is also the midpoint of the long distance Indian Pacific service between Perth and Sydney, as well as the terminus of The Overland to Melbourne and The Ghan to Alice Springs and Darwin. In 1968, a rapid transit metro system was proposed in Adelaide underneath King William Street along with a series of freeways, however it was scrapped due to public protest about the "Americanisation" of the city. As part of the sweeping Metropolitan Adelaide Transport Study plan of 1968, the subway would have included three underground rapid train stations, including one at Hindley Street, with a shopping centre on the level between the street and the rail line. In late 2005 the State Government released a State Infrastructure Plan. This saw a A$56 million upgrade of the Adelaide's sole remaining tramway, from the city centre to the historic beachside resort of Glenelg. The tram line was extended from the city centre to the railway station ( and then to new terminus in the inner north-west suburb of Hindmarsh). In 2017 and 2018 a junction was created at the corner of North Terrace and King William Street with a stub track leading north to one more stop near the River Torrens and to the eastern end of North Terrace. There are now fifteen Bombardier Flexity Classic Light Rail vehicles and nine Alstom Citadis (model 302) in service. Construction of a new junction, branch lines along the eastern end of North Terrace and King William Road and four new stops began in July/August 2017 and opened on 13 October 2018. Air The Adelaide Airport, located near West Beach, is Australia's newest and most advanced airport terminal and is designed to serve in excess of 6.8 million passengers annually. The new dual international/domestic terminal replaced the old and ageing terminals known locally as the 'tin sheds', and incorporates new state-of-the-art features,