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22" would be much better, if you've got the room. As others have said, you're going to be disappointed when you try to run longer trains on 15" or 18". (I disagree that 20 cars is "right" for an train, but that's a different issue.) It sounds like you're willing, and perhaps have the space, to do some redesign before you get started. I'd strongly suggest it. <br /> <br />Why did you mention only Atlas flex track? There are lots of different manufacturers of track. Are you intending to use one of the products that has the roadbed and track together, or are you using cork or homosote?
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