I know that most people recommend 6" track spacing (center-to-center), but I was looking at Gargraves track offerings and noticed that they offer the following curves: O-72, O-80, O-89, O-96.
Essentially, this works out to be 4"/4.5"/3.5" spacing between tracks on a 4 track mainline.
Is there a method to this madness/ reason they offer these diameters? (I'm used to looking at fastrack with the diameters increasing by exactly 12")
There's definitely a way to get the straights to 6" spacing by varying where each curve starts; I'm just beginning to look at track so haven't given too much thought on the "how".