. The science of railways . Fig. 48. ROTARY DUMP CAR. tractor must perform is decided upon in advance,and is known at the time the work is bid upon;a price is also agreed upon for each 100 feet thatmaterial is hauled in excess of the free haul.* I *The length of free haul is different with different roads, butone thousand feet is often adopted. 108 BUILDING AND BEPAIRING RAILWAYS. Earth cuts are handled in much the same man-ner as described for excavations for large earth cuts the contractor often lays anarrow gauge track, and conveys the material indump carts hauled by horses o
. The science of railways . Fig. 48. ROTARY DUMP CAR. tractor must perform is decided upon in advance,and is known at the time the work is bid upon;a price is also agreed upon for each 100 feet thatmaterial is hauled in excess of the free haul.* I *The length of free haul is different with different roads, butone thousand feet is often adopted. 108 BUILDING AND BEPAIRING RAILWAYS. Earth cuts are handled in much the same man-ner as described for excavations for large earth cuts the contractor often lays anarrow gauge track, and conveys the material indump carts hauled by horses or a steam engine,as shown in Figs. 46, 48 and 49. The earth is. Fig. 49. VIEW SHOWING THE METHOD OF DUMPING AROTARY DUMP CAR. excavated and loaded into the cars by picks andshovels or steam shovels, according to the extentof the cut (see Figs. 51 and 54). Where looserock is encountered the work is conducted inmuch the same manner as earth. Hard pan is acemented gravel, and is found in all stages ofhardness from earth to solid rock; however, thelatter occurs but seldom. It occurs sometimesin mass and again in veins from a few inches toseveral feet thick; as generally found it can bebroken up with a specially designed plow (see
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
