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What is Nn3 Page 1 What is Nn3 Nn3 is narrow gauge modeling in N-Scale in its broadest terms. It uses Z-Scale track commonly referred to as 6.5mm track and Märklin Mechanism along with Micro Trains engines and rolling stock operating on Micro Trains trucks and couplers. It encompasses standard gauge N-Scale stock that has been altered to run on narrow gauge rail. The conversions can be complex ones in which the cars is made narrower and the roof line lowered to just a simple change of trucks and couplers. Nn3 as used here is a generic term meaning narrow gauge and does not indicate that we are modeling specifically 3 foot gauge in scale because we are not. The three basic gauges of narrow gauge track being modeled in Nn3 are 3ft 6in. Meter, and 3ft. N-Scale has developed in many countries of the world to encompass many differing standards ranging from the North American or US standard of 1:160 to 1:155, 1:150, 1:148 and even some at 1:144 in other countries. What they all have in common is they all use 9mm track to represent standard gauge track and 6.5mm track to represent narrow gauge. Below is a comparison of the commercially available Z-gauge track which we use for narrow gauge modeling in N-scale from the three suppliers, Märklin of Germany, Peco of the England and Micro Trains of the USA. Recently in Japan there have been several companies starting to provide Z-scale Japanese models using 6.5mm track. The only one producing track at present is AKIA aka RealZJ and we have added there roadbed track to the list. Comparison of the various measurements of "Z" scale track used in Nn3
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