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Top Terms > Materials > Classes of materials > Building materials > Building materials by properties > Aggregates, rock and stone > Consolidated aggregates, rock and stone > Ballast (Railroads) > Subballast

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Subballast (Rbmddvbs)

Definition
Coarse gravel laid as a foundation under a layer of ballast that forms a bed for streets and railroads. (Source: Team: adapted from wordnet.princeton.edu/perl/webwn)
Broader Term
Ballast (Railroads) (Rbmddvb)
Related Terms (Hierarchical)
Asphalt ballast (Rbmddvbb)