Superelevation

Superelevation, also known as cant !
Refers to the deliberate tilting or inclination of the track on curved sections. 
It is done by raising the outer rail in relation to the inner rail to compensate for the centrifugal forces acting on the trains when they negotiate curves at higher speeds.
The purpose of track superelevation is to counteract the lateral forces that tend to push the train outward while going around a curve. 
By raising the outer rail, the track creates a slight inward slope that helps to counterbalance these forces and keep the train on the tracks. This improves stability, reduces the risk of derailment, and allows trains to safely negotiate curves at higher speeds.

The amount of track superelevation required depends on various factors such as the curvature of the track, train speed, and design standards. It is typically expressed as a ratio, such as 1:20, which means that for every 20 units of track length, the outer rail is 1 unit higher .