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The stones placed in and around railway tracks are technically called `ballast'. The railway track, named `Permanent Way' in rail lingo, is a multi-entity structure which comprises the pair of rail lines running parallel, the spaced sleepers, the ballast and the formation.The force exerted by the wheels of the train is transmitted successively in a proportionally diminishing extent down the rails, the sleepers and the ballast to the formation, a well prepared and consolidated road bed.
Wiki User
∙ 11y ago
Wiki User
∙ 9y agoCalled "ballast", the bed of stones acts as an anchorage, leveller and shock-absorber for the track, which is slightly elastic; and helps drain rain-water away. By "leveller" I don't mean the rails are necessarily level with each other, across the line. They are on the straights, but on curves the outer rail is 'super-elevated' - raised slightly to give the trains a banking effect calculated for the heaviest and fastest trains. This is accomplished by packing the ballast higher under the sleepers (I think called 'ties' in US) on that side. Over time the ballast settles so special machines are used to lift the track, re-pack the ballast and set the track correctly to limits of accuracy that are necessarily high where train speeds are high.
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railway minister
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An English dude.
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