. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . With lighter loads the dynamic augment may be decreased, and forwheel loads less than 15,000 pounds it has been taken as of the static load. Figs. 37 to 41 * illustrate types of freight cars and Figs. 42 to 46 * passen-ger cars. It will be seen that the freight cars use a four-wheel truck, eachwheel of which sustains about 20,000 pounds for 100,000-pound capacity carswhen loaded to their full capacity. The minimum spacing of wheels used under100,000-pound cap
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . With lighter loads the dynamic augment may be decreased, and forwheel loads less than 15,000 pounds it has been taken as of the static load. Figs. 37 to 41 * illustrate types of freight cars and Figs. 42 to 46 * passen-ger cars. It will be seen that the freight cars use a four-wheel truck, eachwheel of which sustains about 20,000 pounds for 100,000-pound capacity carswhen loaded to their full capacity. The minimum spacing of wheels used under100,000-pound capacity cars is 5 feet 6 inches. Cars in passenger service asseen from the figures use four-wheel trucks and also six-wheel trucks. The wheel * Figs. 37 to 46 have been taken from the Car Builders Dictionary. 82 STEEL RAILS spacing of the four-wheel trucks is 8 feet and for those having six wheels,5 feet 3 inches. The increase in weight in American passenger equipment in recent yearshas been very great. Steel coaches with wood inside finish used by one ofthe Chicago lines weigh 139,000 pounds. New buffet library cars for another. Fig. 38. — Flat Car, Pressed Steel Underframe. Capacity 100,000 lbs. Weight 38,000 lbs. western line weigh 153,000 pounds. In the design for new sleepers for thePennsylvania it is difficult to limit the weight to 160,000 pounds, and 75to 80 tons may be taken as the weight of modern sleeping cars. The 70-footsteel coaches, which are being built in large numbers, are so heavy that it isnecessary to use six-wheel trucks under them, and these alone weigh over40,000 pounds for two trucks.*
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