International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 466
toms of cuts and the tops of embankments. The actualS^radc line marks the elevation of the top of the rail, and isfrom 15 to 24 inches above subgrade. When gravel orbroken stone is used as ballast, the material excavated inditching the cuts should be loaded on a gravel train and de-posited upon the… … Fig. 510. material deposited on the embankments the better, as theyare bound to cave more or less from the effects of frost andrain, before grass has grown in sufficient quantities to pro-tect them. A section of track ballasted with broken sto-ne is shown in 1050 TRACK WORK. Fig. 510. The ballast…
Railroad engineering
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