. The carman's helper . ^ This sub-tracted from the total energy of 155,000 foot poundswould leave 58,500 foot pounds for the cars to take careof and would result without question in damage to thecouplers, sills, or other parts of the car. The extraenergy would have to be absorbed by the destruction ofthe weakest part of the car instead of by the draft gearabsorbing it. Here is a case that, with the present limitations ofdraft gear travel, could not be controlled. Hence wemust turn to the education of the trainmen, explainingand insisting that, to avoid damage to equipment, carsmust be switche
. The carman's helper . ^ This sub-tracted from the total energy of 155,000 foot poundswould leave 58,500 foot pounds for the cars to take careof and would result without question in damage to thecouplers, sills, or other parts of the car. The extraenergy would have to be absorbed by the destruction ofthe weakest part of the car instead of by the draft gearabsorbing it. Here is a case that, with the present limitations ofdraft gear travel, could not be controlled. Hence wemust turn to the education of the trainmen, explainingand insisting that, to avoid damage to equipment, carsmust be switched with greater care and lower speed. Hit is impossible to do this, then you will have to say to thedraft gear manufacturer, we are forced to use a gear 207 THE CARMANS HELPER whifh will control a shock of 155,000 foot pounds. Howmuch gear travel will you need to do this ?. »08 THE DRAFT GEAR In other words, foot pounds of energy result inpound-pressure resistance. When you reach this Hmit,pound pressure on the car and every car has its limit ofdamage occurs. Regarding the pushing strength of cars, we would re-fer to Fig. 1 showing a pair of sills tested for buffingstrength. These sills are tw^o 15-inch by 40-pound chan-nels with a i^,;-inch cover plate, y^-inch tie plate anddraft lugs all securely assembled according to the bestpractice in car building. In this test, the sills developeda maximum strength of 1,155,000 pounds pressure. Thiswas their limit and under this load they would continueto bend. Just think what it would mean if with one end heldstationary w^e attempted to put enough locomotives push-ing against it on the other end to generate this locomotives of 100,000 pounds tractive effort ordraw bar pull, and 113^ (12) locomotives would be nec-essary to find the maximum capacity of the sills. There can be no doubt that the streng
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectrailroa, bookyear1920
