Hey Lionel, how about making these sweet high-speed Fastrack turnouts? 4.5" center rail offset, for both a high-speed crossover, and the spur. 
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Count me in for some. Please make this lionel.
Id be in for a few... How about some fastrack #5's and #7's while we're at it
I like the idea of #5's or #7's, but isn't there a problem with matching the switch to Fastrack with fixed curvature? Obviously we don't have flextrack. As an example, consider that you would like a high-speed siding with a #5, how then do you add a curve to bring it back around to parallel with the main track? The curvature would need to be a match with the smallest curve section that Lionel makes in a wide radius: 11.25%.
Similar problem in integrating a #5 or #7 into a circle of 36 degrees. You can't make the degrees add up with a #5 or #7. So it seems to me that a turnout with a 11.25 degree curve will be the most flexible for use with the Fastrack system.
Of course, we could investigate a O-96 turnout with 11.25 degree, as that is the widest radius/diameter currently for Fastrack. O-84 is the first step beyond O-72. I wonder if O-96 can be made to create 4.5" center-rail spacing, or would it end up being like 5" center rail spacing. Perhaps I will investigate.
Here is a possible configuration for O-96 11.25* turnouts.
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