. Railroad construction. Theory and practice . e pressure increases the wheel mountsa little higher on the rail until a point is soon reached when theresistance is too great for it to mount still higher. By thismeans is avoided the shock of unyielding impact when the carsways from side to side. When the gauge between the innerfaces of the wheels is greater or less than the limits given inthe figure, the interchange rules of the Master Car BuildersAssociation authorize a road to refuse to accept a car fromanother road for transportation. At junction points of rail-roads inspectors are detailed
. Railroad construction. Theory and practice . e pressure increases the wheel mountsa little higher on the rail until a point is soon reached when theresistance is too great for it to mount still higher. By thismeans is avoided the shock of unyielding impact when the carsways from side to side. When the gauge between the innerfaces of the wheels is greater or less than the limits given inthe figure, the interchange rules of the Master Car BuildersAssociation authorize a road to refuse to accept a car fromanother road for transportation. At junction points of rail-roads inspectors are detailed to see that this rule (as well asmany others) is complied with in respect to all cars offeredfor transfer. TRAIN-BRAKES. 333. Introduction. Owing to the very general misappre-hension that exists regarding the nature and intensity of theaction of brakes, a complete analysis of the problem is con-sidered justifiable. This misapprehension is illustrated by thecommon notion (and even practice) that the effectiveness of \ §333. ROLLING-STOCK. 369. Fig. 204.—M. C. B. Standard Wheel-tread and Axle. 370 RAILROAD CONSTRUCTION. § 334. braking a car is proportional to the brake pressure, and there-fore a brakeman is frequentl}^ seen using a bar to obtain agreater leverage on the brake-wheel and using his utmoststrength to obtain the maximum pull on the brake-chain whilethe car is skidding along with locked wheels. When a vehicle is moving on a track with a considerablevelocity, the m^ass of the vehicle possesses kinetic energy oftranslation and the wheels possess kinetic energy of stop the vehicle, this energy must be destroyed. Therotary kinetic energy will varj^ from about 4 to 8% of thekinetic energy of translation, according to the car loading(see § 347). On steam railroads brake action is obtained bypressing brake-shoes against car-wheel treads. As the brake-shoe pressure increases, the brake-shoes retard Avith increasingforce the rotary action of the wheels. As long
Size: 1257px × 1987px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1900, bookyear1903
