R3/R4 left curved turnout with a polarized frog (N)

R3/R4 right curved turnout with a polarized frog. The R3/R4 curved turnout was developed with the same approach as the R1/R2 curved turnout except that it is matched to the R3 and R4 Radius curves and that a curve angle of 30deg can be taken into account. The resulting track layout has a considerably closer spacing. Despite this, the space required is still not all that large even on smaller layouts.