Märklin 24530 H0 Curved C-track radius 5 643.6mm 30 degrees

Märklin H0 1:87

Track: H0   
 
Radius R5 = 643.6 mm . Arc 30°. Parallel circle to radius R4 at a distance of 64.3 mm. 12 tracks form a circle with an outside diameter of 133 cm.