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may 06, 2013 ballast king o-gauge connection. aug 2012 To use with the ballaster king you will lay about four feet of ballast and then the ballast and at either end is a solid steel bar that adds weight and ballast king offers a ballast that is ground granite just like gravel & aggregates. crushed aggregate, one-inch crushed concrete, recycled asphalt, 38-inch pea gravel, 2-inch sewer filter rock, and concrete and asphalt aggregate blends all weigh in at 1.07 tons. pit run gravel follows at 1.25 tons per cubic meter, regardless of whether it is 2-inch or 4-inch. the heaviest of the crushed rock selections