To the best of my knowledge there is no model of the electric rolling stock that you probably met on currently available however you could get a 'U Boat' which was the older stock that used to operate this service. These used to run from Central to Lithgow (amongst other places). There were also several named services on this route including "The Fish" and "The Chips" which were operated by U Boats for many years. You may have even been traveling on the Fish or the Chips when you met without knowing it!
Model U Boats are made by Southern Rail Models and can be viewed at http://www.southernrailmodels.com.au/page/u_boat.html
Alternatively services from Bathurst to Central are operated by Endeavour DMUs. These services are operated by Lithgow staff and are colloquially known as 'the Bathurst Bullet'.
Model Endeavours are also made by Southern Rail Models, details are available at http://www.southernrailmodels.com.au/files//product_info/xplorer__endeavour.pdf
Perhaps you could travel on the Bathurst Bullet as an anniversary date?
(I have no connection with Southern Rail Models.)
Good luck and happy anniversary!