. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 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 any 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 i
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 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 any 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 of wheel-base on the sharper curves. The next type—(Jb^ four-wheeled trucks with shifting centers—is ri_ip^ — I -^ j|[n|||i| h much more flexible on sharp T-iILJJ^^~l ^^HhJ curvature; it likewise draws the front drivers away from the outerrail. The relative position of thewheels is shown in Fig. 182, in Z, u^ which c represents the position/^ of center-pin and c the displaced : / truck center. The structure and action of the truck is shown inFig. 183. The center-pin (1) issupported on the truck-bolster (2), which is hung by thelinks (4) from the cross-ties (3). The links are therefore
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