This picture has been around for quite a number of years:
Firstly - it is shown in a members picture gallery on the Avan Club website - it has been there at least for 3 years (maybe more - I've only been a member for 3 years).
Secondly - a bloke on one of the Australian Railway discussion forums uses it as his avatar - it's been there at least 6-7 years now.
Thirdly - it appeared in one of yesterday's Australia Day 'reader's pictures' on a major Australian news site.
I don't know its origin, but it is a clever piccie !!!
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Wondering about ShortNorth ? - Short North is the railwayman's nickname for the NSWGR main line between Sydney and Newcastle