Railway tracks are banked on curves so that:

ریلوے کی پٹریوں کو منحنی خطوط پر باندھا جاتا ہے تاکہ

The train may not fall down inward

Necessary centrifugal force may not be obtained from the horizontal component of weight of train

To help in automatic turning of train

None

When a fast moving train takes a curved path, it tends to move away tangentially off the track.