How about five?
Five is correct. [1] Wallangarra (Queensland 3' 6" / New South Wales 4' 8-and-a-half ").
[2] Albury (NSW 4' 8-and-a-half " / Victorian Railways 5' 3"). Journey through Victoria and into South Australia to
[3] Terowie (meeting point of South Australian Railways 5' 3", and 3' 6", lines).
[4] Port Augusta (SAR 3' 6" / Commonwealth Railways 4' 8-and-a-half " Trans-Australian line).
[5] Kalgoorlie (Commonwealth 4' 8-and-a-half" / Western Australian Government Rys. 3' 6").
The significance of 1927 is that in that year, the New South Wales Government Railways' route was completed, through to Broken Hill. 4' 8-and-a-half" east of that city; and 3' 6" west thereof, linking in to South Australian 3' 6" system. This potentially cut out one change of gauge -- though I suspect that taking this route might have been no quicker than travelling, as above, via Melbourne and Adelaide.
EbbwJunction1, the trans-shipment yard is yours.
