. The elements of railroad engineering . 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 embankments wherever needed. The more. 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 ba
. The elements of railroad engineering . 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 embankments wherever needed. The more. 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 extends from 10 inches below thebottom of the ties to the level of their tops, and is shoulderedoutwards from the ends of the ties as shown in the side ditches are 12 inches in depth, the slope of the bal-last and that of the ditch forming practically a straight slopes of the cuts given in Fig. 510, as well as thosegiven in Figs. 508 and 500, are 1 horizontal to 1 verticalThis is the steepest slope at which earth will stand. Thecertain effect of weather is to cause the slope to cave, tlat-tening if and at the same time filling up the ditches. In allrecent railroad construction, Avhere the finances of the com-pany will permit, the slopes of both cuts and embankmentsare made
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
