. Railroad digest . ake-beam, carrying the shoes for the large lower end through the compression connection W, isattached to the beam of the small wheel. This can beso arranged when desired that a spring is interposedbetween it and the beam or shoes on the small , after it has moved through a certain predetermineddistance, it strikes against a stop fastened to the truckframe, which forms a rigid fulcrum for the applicationof the shoes on the large wheels. The result of this com-bination is that the pressure upon the small wheels isalways limited to that which the tension
. Railroad digest . ake-beam, carrying the shoes for the large lower end through the compression connection W, isattached to the beam of the small wheel. This can beso arranged when desired that a spring is interposedbetween it and the beam or shoes on the small , after it has moved through a certain predetermineddistance, it strikes against a stop fastened to the truckframe, which forms a rigid fulcrum for the applicationof the shoes on the large wheels. The result of this com-bination is that the pressure upon the small wheels isalways limited to that which the tension of the springexerts, while that on the large ones is applied to thepull-rod P. In this way the braking resistance can beincreased with the load and that without incurring anydanger of skidding the small wheels, which would not bethe case were it possible to increase the brake pressureupon them indefinitely. RAILROAD DIGEST June, 1901 This is shown in Fig. 11, which is another design oftruck made by the same FIG. 11—MAXIMUM TRACTION TRUCK BUILT BY THEPECKHAM MANUFACTURING COMPANY The St. Louis Car Company, of St. Louis, Missouri, alsobuilds a maximum traction truck like that shown in The framing is formed of two flat bars set on edgeand extending entirely around the truck. They areseparated at the sides, but are riveted together face toface at the ends. The bolster is of wood, with flitch platesand rests on elliptic springs carried on a spring-plankhung from the transoms by ordinary hangers. It playsup and down between two castings, shaped like anglebrackets bolted to the side frames. The pedestal springsare much longer than in any of the other trucks describedand rest upon stirrups riding on the axle box, like one ofthe old horse cars of a dozen years ago. The length ofthese springs coupled to the elliptics should give an easymotion to the car. The truck is light and should be inexpensive to constructand the principal objection to it would be found in thefac
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
