I just found this photo of a wall pack supplied with a UK set. Doesn't mention the output frequency though.

I wouldn't imagine that the plug packs supplied with Australian sets would also perform a frequency conversion i.e. 240v ac 50Hz input 16v ac 60Hz output. Perhaps the EZ-Commander is tolerant of 50-60Hz so as to saleable around the world? Maybe someone from Bachmann can confirm this?

I can get on of these http://www.jaycar.com.au/productView.asp?ID=MP3021&CATID=27&form=CAT&SUBCATID=521 for $24 and then attach a suitable plug so all should be well. I may even have an old one in the shed.
Thanks to all who replied (even if a little off the mark!). A Happy New Year to you all.

Thanks, I thought I had read somewhere that the output was ac, but finding dc should be equally as easy. Does anyone know if the supplied US power supply is auto-switching ie can handle 110-230/240v? If that is the case I would just need a "prong"adapter.

Hi, because the Aussie $ is at parity with the US $, I am thinking of getting a set for my son from ebay, as even with the shipping from the US it still works out around $130 cheaper than buying one locally (unfortunately). What I will obviously need though is a suitable Power Pack.  The set I am thinking of is the one of the Santa Fe EZ-Command Digital sets which is powered by a wall pack.  Can anyone tell me whether I can buy a Aussie standard (240v 50Hz) plug pack from Bachmann (which would obviously be in a set if I bought it locally), or if I have to source something locally, what the output voltage and amperage should be?
Thanks in advance
Andy