File:The Street railway journal (1898) (14575028388).jpg

Identifier: streetrailwayjo141898newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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FIG. 1.—MAXIMUM TRACTION TRUCK FOR TROLLEY CARS, USED IN BROOKLYN ther features in maximum traction construction, but there arenovel points about the truck which merit description. One great advantage of maximum traction trucks, of course, isthe ability of the large wheels to swing between the side sills.This allows the car to be brought closer to the ground, makingaccess to and egress from it more easy. The diameter of the drivingwheels on the ^ruck shown may be 30 ins. or 33 ins., while that of bolster moves when striking a curve. The end spiral springssupporting the bolster being directly underneath the side bearingplates admit of a slight rocking motion which adds greatly to theeasy riding of the car, as it permits the wheels on one side of thetruck to rise independently of the car body. In order that the driving wheels may occupy the least possibledistance between the car sills, it is necessary to bring the center
Text Appearing After Image:
FIG. 2.—MAXIMUM TRACTION TRUCK FOR CONDUIT CARS, USED IN NEW YORK the small or idle wheels is 18 ins. or 20 ins. This gives the latterplenty of room to swing underneath the car sills. The advantages of a swing bolster in relieving the truck wheelsand car body from side thrusts when the car is rounding curvesat high speed have proved of such value that Mr. Peckham, indesigning this truck, decided to retain it, although to secure theshort swing necessary certain changes had to be made in theusual method of attaching the bolster to the car body. The useof a center-bearing swing bolster in relieving the small wheels upon which the car swings near the center of the driving axle.To accomplish this, and at the same time provide a fixed center,the swivel plate is constructed of two segmental parts, male andfemale, one section being attached to the swing bolster and oneto the underside of the car body bolster. The upper and lowerplates are connected by a king pin, which serves to fix thecent

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