A question about Radius

Model Railroader Layouts and layout building
1

Hi all, I’m a newbie here, I’m helping my Father in-law to set up his first train. Question, when laying down a loop where do you measure the radius, inside or outside the track?

Thanks,
Darrin

2

Neither, actually. When you see track listed at 18" radius or 22" radius - that’s to the center line of the track.

–Randy

3

Thanks,
Darrin