Minimum railway curve radius
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The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions. It has an important bearing on construction costs an
90-foot (27 m) radii on the elevated 4 ft 8+1⁄2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii at this cross junction in the northwest corner of the Loop.
Track transition curve
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A transition curve is a spiral-shaped length of highway or railroad track that is used between sections having different profiles and radii, such as between straightaways and curves, or between two di
Minimum railway curve radius
…Railway systems engineering Track transition curve Turning radius…
This sign aside a railroad (between Ghent and Bruges) indicates the start of the transition curve. A parabolic curve (POB) is used.
Brusio spiral viaduct and railway (Switzerland, built 1908), from above