. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . 3000lb3. 6500lbiPER LIN. FOOT Fig. 156. — Class K Engine with 75 per cent Impact. (Freeman.) Computing the deflections of the rail, we find .049 inch for the 100-poundrail and .083 inch for the 80-pound rail on the 7-foot span under the drivers;on the 10-foot 11-inch span between the rear driver and the trailer a deflectionof .24 inch is shown by the 100-pound rail and .42 inch by the 80-pound rail. 216 STEEL RAILS Plotting the curve of probable deflections for t
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . 3000lb3. 6500lbiPER LIN. FOOT Fig. 156. — Class K Engine with 75 per cent Impact. (Freeman.) Computing the deflections of the rail, we find .049 inch for the 100-poundrail and .083 inch for the 80-pound rail on the 7-foot span under the drivers;on the 10-foot 11-inch span between the rear driver and the trailer a deflectionof .24 inch is shown by the 100-pound rail and .42 inch by the 80-pound rail. 216 STEEL RAILS Plotting the curve of probable deflections for the 100-pound and 80-poundrail and using a general average depression under the drivers, proportional tothe uniform load under the drivers, we may find the tie depressions (Fig. 157).. o. oo i)ll-(* O. ;? O O- 2 5O. 3 O Fig. 157. —Track Depression under Class K Loading. (Freeman.) The depression under a uniform load of 6500 pounds is taken at .20 this basis we get the following tie depressions and reactions: TABLE LIL —TIE DEPRESSIONS AND REACTIONS, CLASS K LOADING (FREEMAN) 100-pound Rail. 80-pound Rail. Tie. Depression. Bearing. Depression. Bearing. 1=75 Per cent. 1 = 100 Per cent. 1=75 Per cent. 1=100 Per cent. A , 3,0003,000 7,000 10,000 10,000 7,000 3,000 3,100 7,900 14,000 14,000 11,000 11,000 14,000 14,000 11,000 11,000 3,400 3,400 8,000 11,400 11,400 8,000 3,400 3,500 9,000 16,000 12,600 12,600 16,000 16,000 12,600 12,600 1,5601,560 5,700 13,000 13,000 6,800 1,100 1,300 9,100 15,600 15,600 10,400 10,400 15,600 15,600 10,400 10,400 1,780 B 1,780 c 6,500 D E 14,85014,850 F 7,800 G 1,260 H 1,500 I 10,400 J
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