. The Street railway journal . ic railways upon which the severity of the require-ments has reached such a stage that chilled cast-iron wheelsmay no longer be considered even comparatively important requisites of a wheel are strength and dura-bility with a minimum of weight, and it is probable thatthe solid steel wheel will eventually replace the built-upwheel. The steel used in rolled and forged solid wheelsis exactly the same as that used for tires of medium hard-ness, and the method of manufacture seems to increase thedensity of the material. Rapid wheel flange wear may result from
. The Street railway journal . ic railways upon which the severity of the require-ments has reached such a stage that chilled cast-iron wheelsmay no longer be considered even comparatively important requisites of a wheel are strength and dura-bility with a minimum of weight, and it is probable thatthe solid steel wheel will eventually replace the built-upwheel. The steel used in rolled and forged solid wheelsis exactly the same as that used for tires of medium hard-ness, and the method of manufacture seems to increase thedensity of the material. Rapid wheel flange wear may result from a variety ofcauses. A difiference in diameter of wheels mounted uponthe same axle will cause the flange of the smaller wheel tocrowd the rail. When from this cause the flange has be-come considerably reduced in thickness its further wearmay be almost entirely arrested by giving its mate slightlythe smaller diameter of the two. A soft wheel reducing itsdiameter more rapidly than its mate will cause the flangeto crowd the FIG. 7.—TRUCK FOR CENTER PIN LOAD OF -8,000 LB,; WHEELBASE, 80 IN. A car operated continually in one direction upon a circu-lar track would wear the flanges of its outer wheels morerapidly than those of the inner wheels due to the centrifugalforce of the car; therefore, the character of the road andthe direction in which the car is operated influence theflange wear and it will sometimes be found advantageousto reverse the order of the two trucks of a car. The diametrical wear of the wheel will also be influencedby the character of the road and the direction in whichthe car is operated. At high speeds on curves the inner wheels of the car may slip, while at low speeds the outerwheels may slide. Brake shoes having unequal coefficientsof friction will vary the flange wear directly; also indi-rectly, through varying the diametrical wear of the wheeltread. [Mr. Vauclain then presented views of a number oftrucks for electric service, including those given he
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
