. The science of railways . FiG. 46. RIGHT AND LEFT HAND DUMP CARS. \. 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 t
. The science of railways . FiG. 46. RIGHT AND LEFT HAND DUMP CARS. \. 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
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