. Electric railway journal . 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, withoutexce
. Electric railway journal . 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 the pressure on FIG. 3—HIGH-SPEED DESIGN HAVING SPRINGS OVER BOXESINSTEAD OF EQUALIZER BARS The first truck to be made consisted of a body mountedon an axle and a pair of wooden wheels. The motivepower was man or ox. When the horse became theprime mover, the element of speed thus introduced1brought four-wheeled vehicles, and a flexible board, orbuckboard, was designed to absorb the irregularities ofthe uneven road. This was primitive equalization but itserves as an excellent example of a means for evenly dis-tributing a load over four wheels. During the past few years, for trucks in passengercity service, there has been a demand for minimumweight and minimum height, and conforming to this ap-peal from railway operators, the manufacturer has insome cases eliminated the equalized construction, andsubstituted a frame of rigid design, similar to the oldarch-bar. Such an arch-bar truck may or may not include thespring plank with swing link supports that is commonon freight-car trucks,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
