I model South African Railways in HOn3-1/2, which is HO scale on 12mm gauge track. This
is due to the fact that South African standard gauge is effectively narrow gauge for the
rest of the world, and thus the usual 16.5mm gauge track and wheels used for HO are way
overscale for SAR.
I also model Union Pacific in N scale
My SAR/Spoornet website can be found at