. Railroad construction. Theory and practice . Fig. 181.—Fixed Center be in the center of the track, the front drivers are drawnaway from the outer rail. The rear outer driver tends to rollaway from the outer rail rather than toward it, and so the effect. Fig. 182.—Four-wheeled Truck—Shifting Center. of the truck is to relieve the driver-flanges of an}^ excessivepressure due to curvature. The only exception to this is thecase where the curvature is sharp. Then the front inner drivermay be pressed against the inner rail, as indicated in Fig. 181. This limits the use of this type
. Railroad construction. Theory and practice . Fig. 181.—Fixed Center be in the center of the track, the front drivers are drawnaway from the outer rail. The rear outer driver tends to rollaway from the outer rail rather than toward it, and so the effect. Fig. 182.—Four-wheeled Truck—Shifting Center. of the truck is to relieve the driver-flanges of an}^ excessivepressure due to curvature. The only exception to this is thecase where the curvature is sharp. Then the front inner drivermay be pressed against the inner rail, as indicated in Fig. 181. This limits the use of this type ofwheel-base on the sharper next type—(b^) four-wheeledtrucks with shifting centers—ismuch more flexible on sharpcurvature; it likewise draws thefront drivers away from the outerrail. The relative position of thewheels is shown in Fig. 182, inwhich c represents the positionof center-pin and c the displacedtruck center. The structure andaction of the truck is shown inFig. 183. The ^ center-pin (1) issupported on the truck-bolster (2), w^hich is hung by thelinks (4) from the cross-ties (3). The links are therefore
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1900, bookyear1903
