. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . rivers may be flanged andthe truck made with a rigid center. The blank drivers havethe same total width as the other drivers and of course a muchwider tread, which enables these drivers to remain on the rail,even though the curvature is so sharp that the tread overhangsthe rail considerably. 399. Action of a locomotive pilot-truck. The purpose ofthe pilot-truck is to guide the front end of a locomotive arounda curve
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . rivers may be flanged andthe truck made with a rigid center. The blank drivers havethe same total width as the other drivers and of course a muchwider tread, which enables these drivers to remain on the rail,even though the curvature is so sharp that the tread overhangsthe rail considerably. 399. Action of a locomotive pilot-truck. The purpose ofthe pilot-truck is to guide the front end of a locomotive arounda curve and to relieve the otherwise excessive flange pressurethat would be exerted against the driver-flanges. There aretwo classes of pilot-trucks—(a) those having fixed centers and(6) those having shifting centers. This second class is .againsubdivided into two classes, which are radically different intheir action—Q){) four-wheeled trucks having two parallel axles 430 RAILROAD CONSTRUCTION. §399. and (62) two-wheeled trucks which are guided by a radius-bar. The action of the four-wheeled fixed-centered truck (a)is shown in Fig. 181. -Since the center of the truck is forced. Fig. 181.—Fixed Center Pilot-truck. to be in the center of the track, the front drivers are drawnaway from the outer rail. The rear outer driver tends to roll<iway from the outer rail rather than toward it, and so the effect
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
