Plarail Line 0 Inside Curved Track

I think this little "0" rails, printed or whatever, are done very professionaly, too. "L" and "R" could stand for left and right, indeed. But I think "0" is not a letter O, but a number 0 (zero). I suppose zero suggests the smaller radius then the regular R-03 curves.

We have seen wider rails, recently we had even some pictures and a video of the double track wider then usual double rail, didn't we? But I have never seen rails that can form a circle inside of a R-03 circle.  And if we look at the first photo, they are just perfect, and trains can pass each other on all three tracks. Very, very useful rails. I'd love to see it in regular Tomy assortment...