Sunset Valley has answered that call with a new curved switch in their line of narrow-gauge switches. (They will build one using their 1:32 standard-gauge ties by request.) The outer radius is 90" (roughly 15' diameter), while the diverging track (inner radius) is 38" (a little over 6' diameter). The insulated frog is a #4. The switch is available with either brass or stainless steel, code-250 rails and as either left hand or right hand.