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This chart estimates railroad "degrees of curvature" (degrees per 100') and curve radii using Google Maps
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In Google Maps, draw a tangent across a curve using the "measure distance" tool from the outside rail/line to the outside rail/line intersecting the inside rail/line (see below).
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Compare this value to the charts to find the railroad curve radius. Charts are available for standard gauge rail track and two standard highway lanes in both imperial and metric.
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