i would not want to run my dnano on a 14.5" track. the speeds are soo high in my opinion for such a tight track. the 16" is not bad (for 1 or 2 cars) but i too wish the others had rails. miles mentioned working on rail designs so it may be an option yet.
anytime you have 2 or more cars your going to need a bit more lane width for passing, etc.
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