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
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
Track geometry
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Track geometry is concerned with the properties and relations of points, lines, curves, and surfaces in the three-dimensional positioning of railroad track. The term is also applied to measurements us
Track transition curve
…clothoid" is the most common name given the curve, but the correct name (following standards of academic attribution) is 'Euler spiral'. While railroad track geometry is intrinsically three-dimensional, for practical purposes the vertical and horizontal components of track geometry are usually treated separately. The…
Curve with superelevation of tracks on the Keystone Corridor near Rosemont, Pennsylvania
Railroad track spirit level in place indicating 5 in (130 mm) of superelevation between the inside and outside rails of a curve along the Keystone Corridor near Narberth, Pennsylvania