The ballast is a layer of broken stones, gravel, moorum, or any other granular material placed and packed below and around sleepers for distributing load from the sleepers to the formation. It provides drainage as well as longitudinal and lateral stability to the track.
Functions of Ballast
The ballast serves the following functions in a railway track.
a level and hard bed for the sleepers to rest on.
l Holds the
sleepers in position during the passage of trains.
and distributes load from the sleepers to a large area of the formation.
elasticity and resilience to the track for proper riding comfort.
the necessary resistance to the track for longitudinal and lateral stability.
effective drainage to the track.
an effective means of maintaining the level and alignment of the track.