Reply to "Minimum radius for traditional AF?"

I am not recommending GarGraves, That is merely a cheap and easy way to determine a minimum usable radius. Way easier than trying to regauge Lionel O27 curves. In my opinion GarGraves is easy to curve and cut. I used a reinforced cutoff disc in a Dremel Mototool. My permanent layout uses MTH flex with handlaid turnouts because someone named Tom quit making turnouts before I could place my order.

The reason for GarGraves flex in the old days was because I was using a mixture of Gilbert turnouts and R-O-W Industries turnouts.