in 1917. Further extensions in the 1920s saw it eventually reach Birdum, just south of Larrimah, in 1929, when it was further renamed the North Australia Railway, to distinguish it from the Central Australia Railway, which reached Alice Springs from the south in the same year. Although a railway line from Alice Springs to Darwin had been discussed for many years, the North Australia Railway was closed in 1976. However eventually the standard gauge Adelaide to Darwin Railway was finally completed on 17 September 2003 with the line between Alice Springs and Darwin. The first freight train reached Darwin on 17 January 2004. Adelaide suburban network Adelaide's metropolitan rail network was the last of Australia's five major cities to be electrified. Almost $500 million in funding has been provided in the 2008-09 State Budget for electrification and gauge conversion. However, not all lines have finished electrification, and at this stage, the Belair line will not be electrified. In Adelaide, concrete sleepers, installed since the 1990s are of a slightly more expensive gauge convertible type to facilitate the conversion. List of country railways in South Australia Mid North Morgan railway line: Adelaide – Kapunda (1860), extended to Morgan in 1878, with junctions at Gawler and Roseworthy (now closed and dismantled beyond Kapunda) Port Wakefield railway line: Port Wakefield – Balaklava – Hoyleton (opened 1870, closed and dismantled) Port Broughton railway line: Port Broughton – Mundoora (1876) was horse-drawn uphill, and gravity-powered to carry bagged wheat down to the port Peterborough railway line: Roseworthy – Burra (1870), later extended to Terowie (1880), then Peterborough, with junctions at Hamley Bridge and Riverton (now closed and dismantled beyond Burra) Gladstone railway line: Hamley Bridge – Balaklava, continuing through Brinkworth to Gladstone (now closed and dismantled beyond Balaklava) Port Wakefield–Moonta railway line: Port Wakefield – Kadina – Wallaroo – Moonta (1862 horse-drawn between Wallaroo and Kadina, 1878 to Port Wakefield, now closed) Brinkworth–Kadina railway line: Brinkworth – Snowtown – Bute – Kadina (1879, now closed) Barossa Valley railway line: Gawler to Penrice and Angaston in the Barossa Valley, the Penrice Stone Train carried limestone from a quarry at Penrice to soda works at Osborne, near Port Adelaide until June 2014 – (now mothballed) Spalding railway line: Riverton to Clare and Spalding – closed, the easement is now used for the Riesling and Rattler rail trails through the lower Mid North and Clare Valley Adelaide-Port Augusta