the last of the 4000 class trains will arrive in 2015. the Seaford and Tonsley lines will be 100% electric services. this will free up all the 3000/3100 class trains for the other lines. at this time the 2000 class trains will be retired. works will then begin to electrify the Gawler line to Salisbury.
Sounds like a copy & paste of the Government's "Rail Revitalisation" Speel from a few years ago
as the population in Adelaide grows and more people turn to trains the lenght of trains will grow, this is why some stations are being made longer to allow for 6 cars. more trains will be made to extend the fleet.
a further extension of the Seaford line to Aldinga is planned along with the Gawler splitting to the east and further north beyond Gawler,
Aldinga extension is simply a proposal for some time in the future, nothing concrete. Same goes for Gawler extensions.
it has also been discussed to electrify the Belair line and extend in to Mount Barker.
Discussed and ruled out in the foreseeable future because of tunnel clearance problems.
Any idea of an extension to Mount Barker has come from people who don't understand the difference between SG and BG track!
The outer harbor and Garange line will be electrofied and will be shared use with Trams, it is highly likely the outer harbor line will be replaced with light rail.
Once again the "Tram/Trains" idea comes from the original Rail Revitalisation documents, part of Mike Rann's Coast to Coast Tram idea. Poorly thought out concept requiring Dual Voltage Trams and doesnt take track differences and platform heights into account.
And besides one of the main selling points was providing Trams to the West Lakes sporting stadium, with the new Adelaide oval development, the need to provide mass transport for Sporting fans to West Lakes has evaporated!
Oh.... where is "Garange"? I Presume you mean Grange.