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This chart estimates railroad "degrees of curvature" (degrees traversed per 100' of linear travel) and curve radii using Google Maps
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In Google Maps, draw a tangent across a curve using the "measure distance" tool (accessible by right-clicking on the map) 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 (12') and metric (3.75m).
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Standard gauge-feet also has a calculation which can calculate the curvature based on an input chord length.
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