30,000, 35,000, and 40,000 lbs. Thespot or depression left by the wheel could be seenafter the 20,000 lbs. load had been imposed, but notbefore. The difference between the areas of contact of thewheels under cars and locomotives and the wheelstested in the laboratory, in which the area waslarger,… … 37,500 Lbs. Av. Pressure per Sq. In. 138,888 Lbs. Area .27 Sq. In.
Railroad cars
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