. American engineer and railroad journal . y draft sillson these cars, the arrangement of which is shown inone of the illustrations. The center plate is of aspecial form adapted to reach the same trucks usedunder the heavier equipment. The upper structureof these cars corresponds very closely with the coach. Six-Wheel Truck. The six-wheel truck which is used under thebaggage and postal cars is designed along the samelines as were used in the four-wheel truck previous-ly described. SILL CONSTRUCTION—ALL-STEEL SUBURBAN CAR. The very deep center sills used on this equipment give t
. American engineer and railroad journal . y draft sillson these cars, the arrangement of which is shown inone of the illustrations. The center plate is of aspecial form adapted to reach the same trucks usedunder the heavier equipment. The upper structureof these cars corresponds very closely with the coach. Six-Wheel Truck. The six-wheel truck which is used under thebaggage and postal cars is designed along the samelines as were used in the four-wheel truck previous-ly described. SILL CONSTRUCTION—ALL-STEEL SUBURBAN CAR. The very deep center sills used on this equipment give thetruck center plate but little clearance with the center axle ofthe truck and much care in designing was required in order tosecure sufficient strength. The design adopted, as is clearlyshown in the illustration of the truck, consists of built up steelgirders resting on the two truck bolsters and carrying betweenthem in the center a short connecting girder, for carrying thecenter plate, which is built up in channel shape with the lower. TTt SIX-WHEEL ALL-STEEL TRUCK—70-FOOT POSTAL CAR. PENNSYLVANIA RAILROAD. July, 1907. AMERICAN ENGINEER AND RAILROAD JOURNAL. 263 flanges spanning the center axle. Aheavy horizontal steel plate binds andstiffens this whole structure as isshown in the illustrations. The twotruck bolsters are of the same de-sign used on the four-wheel truckand rest on sixteen elliptical springs,four at each end of each wheel pieces consist of two lo-in, channels and are spaced and se-cured by four cross bars of a specialpressed steel shape, being droppeddown in the center to clear the cen-ter sills. The weight is transferreddirectly to the journals of the outertwo wheels through the wheel pieces and the nests of coiled springs on each box in the same manneras for the four-wheel truck. The center wheel, however, re-ceives its load through similar coiled springs, the spring capof which is connected through a short equalizer by hangers tothe 2: I equa
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
