. Bulletin . isks connected with cable cars running oninclined tracks is the danger of cars starting at the top of theincline before the cable is attached. A runaway car loaded Avithseveral tons of stone is a most serious menace to life and is destruc-tive to equipment. In many quarries cars are hauled to the top ofthe incline by a cable or, more commonly, by means of a the necessary change in cable attachment is being made thewheels may be blocked with a piece of wood or stone placed on therail. This is not a secure means of holding the car, as the blockmay slip or be accidentally
. Bulletin . isks connected with cable cars running oninclined tracks is the danger of cars starting at the top of theincline before the cable is attached. A runaway car loaded Avithseveral tons of stone is a most serious menace to life and is destruc-tive to equipment. In many quarries cars are hauled to the top ofthe incline by a cable or, more commonly, by means of a the necessary change in cable attachment is being made thewheels may be blocked with a piece of wood or stone placed on therail. This is not a secure means of holding the car, as the blockmay slip or be accidentally removed, permitting the car to startbefore the controlling cable is attached. An efficient means of pre-venting such accidents was observed at a Pennsylvania ganisterquarry and is shown in figure 19. It consists of a timber blockwhich rises from a depression between the rails and meets thebuffer of the car. When the car is ready to descend, the timber,controlled by a lever, descends into a pit out of the Figure 19. Timber buffer to prevent loaded car from running down incline before cable isattached. As an additional precaution a derail is placed a short distancefrom the top of the incline. With a three-rail system the derailshould be on both outer rails. To be most effective it should slidetoward the center rail. It thus forces the car outward, directs itaway from the track, and caiises it to travel where it can do theleast damage. The derail is thrown until the car begins to descendand until its safe control is recognized; the derail is then throwninto place by a lever before the car reaches it. It is unsafe to stand near inclined tracks where loaded cars aredescending. Xot only is there the ever-present danger of the carsjumping the tracks, but rock masses may roll from the cars and fallbeside the tracks. 116 SANDSTONE QITARRYING IN THE UNITED STATES, SAFETY DEVICES OX TRANSFER AXI) CANG CARS. Workmens hands are frequently injured by transfer-car wheelswhere they proje
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