. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . andunder the front wheel about 3000 pounds per lineal foot (Fig. 154). Under the drivers we have a span of 7 feet and a uniform load of 6400pounds per lineal foot. With the 100-pound rail this loading would cause adeflection of .047 inch and with the 80-pound rail a deflection of .08 inch. The average uniform load between the rear driver and the trailer beingabout 5000 pounds per lineal foot, the deflection of the 100-pound rail inch, while the 80-pou
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . andunder the front wheel about 3000 pounds per lineal foot (Fig. 154). Under the drivers we have a span of 7 feet and a uniform load of 6400pounds per lineal foot. With the 100-pound rail this loading would cause adeflection of .047 inch and with the 80-pound rail a deflection of .08 inch. The average uniform load between the rear driver and the trailer beingabout 5000 pounds per lineal foot, the deflection of the 100-pound rail inch, while the 80-pound rail deflects .22 inch. It will be seen by a glance at Fig. 155 that the tie reactions vary with thestiffness of the rail, being much more uniform with the heavier rail. STEEL RAILS 6o in r .Q 7 O O 9. ° O m o oo oO m ^i 9-2 c i -o 6 O 10 r^ tocu - =? 7 J o 6 oo o oo o o N - SCM CM (0 \\0-7Vz [ . »9- 7 ^ + £ + ^O Q OO O O OO O OQ OO Omo m 0 :r O -N. oo mo in w CM -^ CM <t ~~ CM — O 8 L y \ly \iJ \L J 3700 lbs. PER LIN. FOOT 4000 lbs. 3000 lbs. Fig. 154. — Class I Engine with 75 per cent Impact. (Freeman.). Fig. 155. — Track Depression under Class I Loading. (Freeman.) Plotting the most probable deflection of the 100-pound rail (shown in solidline) and the 80-pound rail (shown in broken line), and then taking the tie re-actions as proportional to the ordinates to the curves of deflection, we mayexpect the following depressions and reactions: TABLE LL —TIE DEPRESSIONS AND REACTIONS, CLASS I LOADING(FREEMAN) Tie. 100-pou nd Rail. 80-pound Rail. Depression. Bearing. Depression. Bearing. A 5,3008,10010,2008,1005,3005,3009,40011,80011,8009,7009,70011,80011,800 2,20010,00012,60010,0002,2002,2009,50013,40013,4009,5009,50013,40013,400 B c D F G. . : I . J K L M STRESSES IN THE RAIL 215 If we use these tie reactions and assume with Winckler that
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