. Electric railway journal . ityto assist the industry by notifying the editors of this paper of new thingsthat have been done. Information may be sent in the form of rough notesor short articles, and special rates will be paid for all accepted material. Truck Equalization The Author Discusses the Use of Equalizer Bars forTrucks in Various Classes of ElectricRailway Service BY S. A. BULLOCK Manager Electric Truck Department The Baldwin LocomotiveWorks It is desirable that all trucks be equalized. Equalization is the provision of means for distributingequally the center-plate load on the wheels
. Electric railway journal . ityto assist the industry by notifying the editors of this paper of new thingsthat have been done. Information may be sent in the form of rough notesor short articles, and special rates will be paid for all accepted material. Truck Equalization The Author Discusses the Use of Equalizer Bars forTrucks in Various Classes of ElectricRailway Service BY S. A. BULLOCK Manager Electric Truck Department The Baldwin LocomotiveWorks It is desirable that all trucks be equalized. Equalization is the provision of means for distributingequally the center-plate load on the wheels by applyingparallel members, resiliently connected, so that they mayform, in a vertical plane, an angle with each other, with-out producing undue stress upon either member. Truck equalization may be of two kinds; first, side-frame equalization, which is the so-called truck equaliza-tion; and second, bolster equalization. In side-frame equalization the top member is theframe, while the lower parallel member is the equalizer,. FIG. 1—PLAIN ARCH-BAR TRUCK WITHOUT SWING LINKS, USEDFOR LOW-SPEED CITY SERVICE this being commonly called, in consequence, the equalizerbar. Bolster equalization is exemplified by the con-struction in which there is supported from the tran-soms a spring plank or other means for carrying thesprings which support the ends of the truck bolster, sothat the truck bolster and transoms may form an anglewith each other in a vertical plane without undue stresson either the transoms or bolster. Bolster equalizationis invariably provided for all passenger trucks, withoutexception. The combined equalization of side frame and truckbolster produces double equalization, that is, equalizationin vertical planes parallel to and transverse with the the car body may be supported on center plates,which act as universal joints, permitting one or morewheels to move out of the normal horizontal plane with-out producing undue pressure at any one wheel, butequalizing t
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