Fastrack spacing

The closest you get is O-31 at about 5.25”, O-58 looks about 6”, O-48 about 6.5”, O-60 about 5.5” and O-72 about 5.5”.

Thanks 👍

Sorry another question - would an 072 turnout with an 060 full curve maintain a parallel spacing of about 5 inches ? Thanks

Short answer is no, as shown in the left figure. Using O-48 for the inside loop along with the circled spacers as shown on the right figure lets you do it. The loops can be increased in size by simply adding more equal length spacers. Both crossovers aren't necessary, they're just to show the spacing.