Railway and Locomotive Engineering . de frames are formed of twosteel castings; one of which has pedestal is about 23,300 lbs., of which one-half iscarried by this pin. If SO per cent, beadded to the static load for runningstresses, it puts the shear on these pinsat almost exactly 10,000 lbs. per sq. section. Each casting has a spring seat with itscenter 18 in. from the end axle. The totalwheel base is 9 ft. This arrangement ofthe side frames makes for perfect verticalflexibility and adaptation to any inequal-ities of the track. The bolsters are all united in a singlecasting which has th
Railway and Locomotive Engineering . de frames are formed of twosteel castings; one of which has pedestal is about 23,300 lbs., of which one-half iscarried by this pin. If SO per cent, beadded to the static load for runningstresses, it puts the shear on these pinsat almost exactly 10,000 lbs. per sq. section. Each casting has a spring seat with itscenter 18 in. from the end axle. The totalwheel base is 9 ft. This arrangement ofthe side frames makes for perfect verticalflexibility and adaptation to any inequal-ities of the track. The bolsters are all united in a singlecasting which has the central equalizingbolster and the two cross bolsters, whoseends rest on the springs. The sections ofthe several cross pieces are U-shaped, in-verted, and the longitudinal or wheel pieceis a single plate. The equalizing bolsterchops down close to axle so that it isWH in. below the face of the side bearingseat. This makes it possible to lower thewhole body of the car. The wheels are33 in. in diameter and each truck weighs17,850 END ELEVATION 120-TON C^R VIRGINI.^N RAILWAY. the lower one set 3 ft. 1 in. above the jaws to take the journal boxes of the Owng to the heavy braking power used top of the center sill. center and one of the end pair of wheels, in connection with the empty-and-load It will be seen that the car is so braced The other casting has the pedestal jaws brake on these cars, whereby a total brak- that the sides act as girders to carry the for the third set of oil boxes and is con- ing pressure equal to 40 per cent, ot the major portion of the load which is nected to the first or main casting by a total weight of the loaded car is put upon brought back to the center plates through V/2 in. pin. The static load on each the brakeshoes. it is necessary to use a the very stiff bolster-;. wheel, barring the weight of the truck, clasp brake with two shoes for each wheeL July, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 185
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
