We have recently changed the R designation of our LGB compatible G-scale track curves and switches away from an arbitrary nomenclature used by other manufacturers to a representation of the closest effective radius in feet. So a R4 curve is a 4' radius curve, a R3 switch is a 3' radius curve.
Important Information to G-scale track
We are often asked what track to choose. It all starts out with the question for the track height code 215, 250 or 332. Some argue that code 215/250 looks more prototypical. That actually depends. Modern standard rail would be correctly code 300 if it is to scale. But what is actually 100% to scale in our hobby? Not much and for some things there are very good reasons such as operational safety.
Code 332 G-scale rail gives you just that much clearance compared to code 250 or even code 215 rail. Very often we seem to forget that none of our rolling stock is weight wise to scale. Weight is the other very important factor that determines how you car will stay on G-scale track. I have noticed in my own layout that I have less problems with engines but more problems with cars derailing, and the difference is mostly weight. There is a reason why LGB choose 3mm wheel flanges over 1.5mm.
The next question is about material Aluminium/Brass/Nickel plated Brass/Stainless Steel/Nickel Silver.