R3/R4 left 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 30° 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.

Curved turnouts for the R3 and R4 Radius curves.Turnout curve is 30°. An electric mechanism can be installed in the turnout.