I know Victoria is a 'shoot first, ask questions later' kinda state :P
SA, no idea!
but in NSW at least...
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(http://www.4020.net/words/photorights.php)
What about railway stations?
This is a different story for they are public space (even if they are not, technically speaking, "public land"). So provided you don't make a nuisance of yourself, you should be fine. In 2004 the NSW Minister for Transport Services spelled it out (at NSW Legislative Council Hansard, 24 Feb 2004, p.6394, art.53):
It is not an offence to take a photograph on a train or at a station.
Transit officers are required to detect graffiti and other offences as they occur, as well as protecting State Rail property from vandalism. I am advised taking photographs of graffiti may indicate a connection between the person and the graffiti they are photographing, as graffiti offenders often photograph their work. See also the earlier Q&A in NSW Legislative Council Hansard, 12 Nov 2003, p.4731, art.22.
In 2006 there was a lengthy discussion about this issue at Railpage Australia. As many advised, apply a little common sense. If you are going to linger and take formal photographs (eg. using a tripod or for publication), then contact the Station Master first. For casual hand-held photography however — don't ask, shoot.
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Scotty