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Jason, Bachmann recognized they had a problem and were offering replacement gears for their locos.Contact Bachmann customer service.Rick
Any scale tagged n-30 is 30" gauge.The whole reason it was created in the first place was to get affordable narrow gauge.On30 really took off once Bachmann started producing it.Personally I never let that 6" difference bother me because it was still very ovious that it wasn't standard gauge.I don't have narrow gauge anymore as I was getting in to deep in to many scales.I miss it but I ain't going back to it.
On30 would really be my answer if it wasnt for space. A O scale layout on a door would be pretty crowded I think. Thats why I considering HOn30 or maybe HOn3. I dont plan to have too many locos, 3 maybe 4 at most. I'm not dead set on D&RGW, just dead set on having at least one K27 in my fleet lol
There is a lot available in Nn3: https://www.republiclocomotiveworks.com/ Go to the on-line catalog, chose "available" in the availability option. Also check Shapeways http://www.shapeways.com/search?q=Nn3 and http://www.shapeways.com/search?q=n+scalehttp://www.x2011west.org/handouts/Nn3-Overview.pdf has a section on DCC The Nn3 layout at the 2011 NMRA convention in Sacramento was DCC.