The FasTrack system geometry necessitates having many small fitter sections.
Here is a chart showing which pieces you need to cover a given distance:
FasTrack Chart
The problem with the Fastrack geometry is that the "O36" straights should be 12.73" long, not 10", the 90 degree crossings should be 10.54" across, and the 45 degree crossings should be 14.91" across. If this were the case, you wouldn't need so many small "fitter" sections for standard track layout configurations.
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