. Railroad construction. Theory and practice . Fig. 184.—Two-wheeled Truck—Shifting engine with long wheel-base may be made to pass arounda comparatively sharp curve by omitting the flanges from themiddle drivers and using this form of pilot-truck. As in theprevious case, the eccentricity ofthe center of the truck relativeto the center-pin induces a cen-tripetal force which draws thefront of the engine inward. Butthe swing-truck is not the onlysource of such a force. If theradius-bar pin were placed at O (see Fig. 185), the truck-axle would be radial. But the radius-bar is always mad
. Railroad construction. Theory and practice . Fig. 184.—Two-wheeled Truck—Shifting engine with long wheel-base may be made to pass arounda comparatively sharp curve by omitting the flanges from themiddle drivers and using this form of pilot-truck. As in theprevious case, the eccentricity ofthe center of the truck relativeto the center-pin induces a cen-tripetal force which draws thefront of the engine inward. Butthe swing-truck is not the onlysource of such a force. If theradius-bar pin were placed at O (see Fig. 185), the truck-axle would be radial. But the radius-bar is always made some-what shorter than this, and the pin is placed at 0, a considerabledistance ahead of 0, thus creating a tendency for the truckto run toward the inner rail and draw the front of the loco-motive in that direction. This tendency will be objectionablygreat if the radius-bar is made too short, as has }>een practicallydemonstrated in cases when the radius-bar has been subse-quently lengthened with a resulting improvement in the running
Size: 2442px × 1023px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1900, bookyear1903
