Ballast

Ballast may mean:

railroad or railway ballast: gravel or cinders forming the track-bed on which sleepers (ties) and track is laid, for proper drainage
a ship's ballast: water, sand, rocks, or bricks used to weight it down when it has very little cargo (though water may contain invasive species of pests)
an electrical ballast see resistor, or for neon lights or fluorescent lights: see transformer or induction coil

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