It doesn't really seem to need one; and where, without disturbing overmuch the current set-up, could one be put?
And if the place is intended to be strictly covering the period encapsulated within 1851-61, [pedant's hat]the railway didn't arrive in Ballarat until 1862[/pedant's hat].
Throwing the pedant's hat in the corner, to be fair to RustyRick, the railway, from its arrival in Ballarat, would have played no small part in the whole gold thing, considering that much mining continued in the ensuing decades.
'nuff of that, back on topic.
Jim Longworth has recently written a book, Amusement Railways of Australia. It has been sold through the LRRSA bookshop; on checking the link below, I find that it's currently unavailable but maybe that could change in the future.
I don't know, but it might be possible that it's available elsewhere.