If you mean the timber tram at Alexandra, Victoria, here is a very brief summary:
A museum at the former railway station has a circuit of 610 mm track. Rides are available twice a month. http://www.alexandratramway.org.au
This is the last fragment of an extensive network of 61 cm tram lines that extended generally south east of the station. Originally built for timber harvesting and sawmilling, it was utilised to build the Rubicon Hydro Electric Scheme in the mid to late 1920's. The ultra narrow gauge network was also used to transport agricultural produce to the VR station at Alex.
While the timber tram ceased operating after the Second World War, a scenic but isolated remnant operated to service the hydro scheme until the turn of the century. The tracks are still in place and two trestle bridges have been rebuilt recently, it makes a pleasant hiking destination.
All this is covered in fascinating detail in a lavishly illustrated book by Peter Evans called Rails to Rubicon,
published by the Light Railway Research Society in 1994.