The frog number of a switch is defined as the ratio of distance from the
where the routes join to the point where the diverging rail crosses the
centerline of the non-diverging track.
Note: All Tie Length Calculators now have Frog Calculations
(Hit the "Back" button to go back to the main page.)
This program calculates the frog number you need for a switch based on the turning radius of the diverging branch, as well as the frog angle and the lengths of the point rails.