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Piedsou has it right. anything with the n3 suffix represents three foot (36") gauge. Anything with n30 as a suffix represents 30" gauge. On30 breaks down like this: O=O scale, n=narrow gauge and 30=30"gauge. It just so happens that in O scale, 30" is the same gauge as standard HO track. On30 used to be referred to as On2 1/2, As Bob pointed out. The 2 1/2 of course represents 30" or 2 1/2 foot gauge. It can get confusing when looking at narrow gauge stuff. Just remember gauge is the distance between the rails, and scale is the actual size of what's being modeled. The two are not always the same. I have a good friend who's really out there with narrow gauge stuff. He's starting to get into 7/8n2. Get you some of that. That's 7/8 scale n= narrow gauge 2= of course two foot gauge rail. Here's his site: http://www.dawgstrainhouse.com/ There's a lot of good information there. He models all kinda narrow gauge stuff. One of his Gn15 (G scale narrow gauge 15" rail) was featured on Carl Arendt's Micro layout page. He was featured in the November scrapbook, I believe. I went from HO to On30 and haven't looked back. Lots of freedom of expression. If you scratchbuild something, chances are there was a prototype.
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