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[2c]Opting for Nn3 is very brave (especially if you are new to the hobby?), having modelled in OO9 (the British equivalent of HOn30) before, there is a problem with getting the stuff to run reliably. The problem seems to be is when you use a commercial N-gauge loco chassis then stick a larger HO narrow gauge body on top you alter the centre of gravity and the thing becomes unstable resulting in poor running. I dare say that some of the brass items avaiable in HOn30 don't suffer this way. IMHO going even smaller and using Z gauge track is asking for trouble, I know some folks do it - maybe the Marklin mechs are better built. You say the ore car system was narrow gauge - do you know what gauge it was? There are huge variety of narrow gauges - the most common in the US was 3ft gauge, but in industrial plants there was stuff down to 15" gauge. In HO there are two commercially supported options for narrow gauge modellers: HOn3 (10.5mm track for 3ft guage models) and HOn30 (9mm track correct for 2ft6in gauge), although many use HOn30 to represent 2ft gauge prototypes such as the Maine 2ft gauge railroads. In N scale only Nn3 (6.5mm track which scales out to about 3ft4in) is commercially supported.
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