Negative Cant / Super-elevation in Railways
Negative Cant/ Super-elevation is a unique situation which occurs when the main line lies on a curve with a branch line turnout of contrary flexure
It is a contradictory situation where the inner rail is raised above the outer rail
Super-elevation/ Cant in Railways
It is the difference in height between the outer and the inner rail on a curve. It is provided to compensate the centrifugal force which causes irregular stressing of rails and other track components
Positive when the outer rail on a curved track is raised above the inner rail
Negative when the inner rail is raised above the outer rail
This is a unique situation which occurs when the main line lies on a curve with a branch line turnout of contrary flexure. If the branch-out is on the same side - similar flexure, there is no problem of negative cant.
This is a contradictory case where the superelevation necessary for the average speed of trains running over the main line curve cannot be provided.
AB - outer rail of the main line curve - must be higher than CD.
Branch line - CF should be higher than AE or point C should be higher than point A.
Check the image above to understand. In such cases, the branch line curve has a negative superelevation. Speeds on both tracks must be restricted, especially on the branch line
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