We always see crushed stones along the railway track.
It is not for look !!!!
These crushed stones are called to the track ballast.
They help to keep the railway tracks in place.
They ensure the tracks at correct distance from each other.
Track ballast need to be crushed and angular.
Otherwise they would roll under the weight of passing train.
These stones don't allow vegetation to grow on railway track.
Otherwise they could weaken the ground on which railway tracks are situated.
They also keep water from reaching the track and softening the ground.
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