. Railroad construction. Theory and practice . ivers 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. 315. 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-
. Railroad construction. Theory and practice . ivers 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. 315. 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(h) those having shifting centers. This second class is againsubdivided into two classes, which are radically different intheir action—(b^) four-wheeled trucks having two parallel axles 340 RAILROAD CONSTRUCTION, §315. and (b2) two-wheeled trucks which are guided by a ^radius-bar. The action of the four-wheeled fixed-centered truck (a)is sho\\Ti in Fig. 181. Since the center of the truck is forced. 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
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