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What little I know so far about narrow guage....On3 means O scale that's narrow and 3 feet from rail to rail in real life (if it sounds like I just arrived in the world of model railroading, I have...please bear with me). On30 means O scale that's narrow and 30" from rail to rail. I am also...

Hello everyone -- this is my first post. My stepfather and I are going to build a layout from the ground up. I'm a Mac computer guy, and I came across RailModeller. Seems like a nice shareware product...the only problem is I don't see any pre-set libraries for On3. I'm relatively clueless...