what are ballast boulders

  • Ballast: Know Its Definition, Functions, Types & Requirements

    Ballast is a granular material which is placed and packed below and around the railway sleepers. Different types of ballast materials used are broken stone, sand, …

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  • Ballast | Trains Magazine

    Battling the elements. Railroad track, like buildings, needs good drainage to remain in top condition for long periods. Ballast provides immediate drainage of water …

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