Ballast

--- Track Ballast ( Gravel or Cinder s) forms the Railroad or Railway track-bed on which Sleepers and Track is laid. The ballast allows for proper Drainage and minimizes Frost Heaving .

--- Ship's Ballast ( Water , Sand , Rock s, or Brick s) is used to weight a Ship down when it has very little Cargo (though water may contain Invasive Species of Pest s). It can also be a Mass used in a Sailboat to provide stability.

---A Ballast Tank is a device used on Submarines and other Submersibles in order to control bouyancy, allowing the vehicle to surface or dive.

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