Turnout Design Calculator
Calculate railroad switch/turnout geometry from frog number — frog angle, lead length, curve radius, and maximum diverging speed.
Inputs
in
Results
Frog angle
5.73°
Turnout curve radius944 ft
Degree of curve6.07°
Lead length47.1 ft
Overall turnout length70.6 ft
Max diverging speed1,422.3 mph
Heel spread5.65 in
Closure rail length28.2 ft
Speed class1
How to Use This Calculator
- Enter Frog number (N) and Max unbalanced cant.
- Review the Frog angle (°) result.
- Use Turnout curve radius (ft) and Degree of curve (°) to inform your decision.
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