Wayno wrote:excuse my ignorance - can someone please explain this to me...
What's the history of railway track gauges in south australia,
SA agrees with Vic and NSW that all track should be broad gauge. SA orders broad gauge stock before Irish NSW commissioner is replaced with Scottish NSW commissioner who prefers standard gauge. Lack of money results in some lines being built to narrow gauge instead. Some of these are later converted to broad gauge. Standard gauge interstate lines are constructed. Some places have triple gauge track. Eventually they start converting broad gauge lines to standard.
and what's the future have in hold? will this resleepering bring all SA rail onto a single gauge (and which one - narrow, broad, standard? and how wide is it?),
Not quite all of SA, as the Eyre Peninsula will still be narrow gauge. But nearly all of SA will be standard gauge (1435mm)
and will it be the same for commercial trains and all public rail transport (suburban trains and trams).
Yes.
Also, are other states heading in the same direction (ahead or behind) ourselves?
Vic is now a mixture of broad and standard, and not likely to completely standardize any time soon if ever - despite having standard gauge trams, the Melbourne suburban train system's completely broad gauge, and they've got a lot invested in it. Queensland's narrow gauge apart from a standard tentacle from NSW. It's likely to stay that way, though a few more standard gauge lines will gradually intrude. WA is similar, though with a few more standard gauge lines. NSW is standard except for a few cross border tentacles. And Tasmania's entirely narrow gauge.