Indeed it is international, and there are a few expat Australian members too.
Sadly next to no opportunity is taken to exploit the expatriate market by the railway publishing industry in Australia. There is a market about the size of the city of Hobart in the United Kingdom, the vast bulk in or around London.
Further, the Brits are renowned for their interest in trains from all round the world, but most particularly in countries where there was a strong British input and influence on local railways. As one of the staff said at a London transport bookshop yesterday, recounting his long held frustration at his failure to convince an Australian publisher that there was a market for Australian railwayana in the UK, the guy 'couldn't understand why we'd be interested in Australian railways. Why? We only built the things, that's why!'
New Zealand publishers by contrast are far more inclined to notice the niche and cater to offshore interest.
The only Australian railway magazine available in London is Narrow Gauge Down Under, ironically the magazine with the least local content- every time I look at it, it seems to be focussed on American narrow gauge.
A wasted opportunity.
Ben