The following businesses and sources have provided various components of the railway.
I have found all of these suppliers to be reputable businesses, who give excellent service whether in person, via mail, or internet order (where applicable):
Eltham Home Timber & Hardware (Eltham, Vic, Australia) http://www.elthamhome.com.au/
Canzonet Timber (Research, VIC, Australia) Canzonet - Contact
LED Wholesalers, (Burlingame, Ca, USA) www.ledwholesalers.com/store/index.php
End Of The Line Hobbies, (Victor Harbour, SA, Australia) http://endofthelinehobbies.com.au/
DCC Concepts, (Naval Base, WA, Australia) www.dccconcepts.com/
The Buffer Stop, (Preston, VIC, Australia) Buffer Stop - Contact:
Gwydir Valley Models, (Glen Innes, NSW, Australia) www.gwydirvalleymodels.com/
TrainWorld, (East Brighton, VIC, Australia) www.trainworld.com.au/
Branchline, (Croydon, VIC, Australia) www.branchline.com.au/
Tony's Train Exchange, (Essex Jct, Vt, USA) www.tonystrains.com/
Jaycar Electronics (Various sites, VIC, Australia) www.jaycar.com.au/