Railway Turnout & Crossing Geometry Calculator

Compute turnout closure curve radius ($R$), lead length ($L$), crossing frog angle ($\theta$), and maximum diverging branching speed.

Nominal Track Gauge G:

Crossing Ratio / Frog No. N (1:N): Common: 1:9, 1:12, 1:18.5, 1:26

Switch Entry Angle α_sw (deg):

Max Diverging Cant Def D_lim (mm): Turnouts have 0 applied cant (Ea=0)

Turnout Method:

Crossing Angle (θ)

Max Diverging Speed (V_div)

Branch track speed limit

Closure Curve Radius (R)

Turnout centerline radius

Lead Length (L)

Switch toe to theoretical frog apex

Turnout Alignment Details

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