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File:Railroad construction - theory and practice - a textbook for the use of students in colleges and technical schools (1908) (14735776476).jpg

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Identifier: railroadconstruc01webb (find matches)
Title: Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools
Year: 1908 (1900s)
Authors: Webb, Walter Loring, 1863-1941
Subjects: Railroads
Publisher: New York : J. Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ly 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 mass of the vehicle possesses kinetic energy oftranslation and the wheels possess kinetic energy of rotation.To stop the vehicle, this energy must be destroyed. Therotary kinetic energy will vary 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 with increasingforce the rotary action of the wheels. As long as the wheelsdo not slip or ^skid on the rails, the adhesion of the railsforces them to rotate with a circumferential velocity equal tothe train velocity. The retarding action of the brake-shoe 400 RAILROAD CONSTRUCTION. I 333.
Text Appearing After Image:
Fig. 204.—M. C. B. Standard Wheel-tread and Axle. § 334. ROLLING-STOCK. 401 checks first the rotative kinetic energy (which is small), andthe remainder develops a tendency for the wheel to slip on therail. Since the rotative kinetic energy is such a small per-centage of the total, it wdll hereafter be ignored, except asspecifically stated, and it will be assumed for simplicity thatthe only work of the brakes is to overcome the kinetic energyof translation. The possible effect of grade in assisting orpreventing retardation, and the effect of all other track resist-ances, is also ignored. The amount of the developed forcewhich retards the train movement is limited to the possibleadhesion or static friction between the wheel and the rail.When the friction between the brake-shoe and the wheel ex-ceeds the adhesion between the wheel and the rail, the wheelskids, and then the friction betw^een the w^heel and the railat once drops to a much less quantity. It must therefore beremembered at

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Author Webb, Walter Loring, 1863-1941
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Flickr tags
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  • bookid:railroadconstruc01webb
  • bookyear:1908
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Webb__Walter_Loring__1863_1941
  • booksubject:Railroads
  • bookpublisher:New_York___J__Wiley
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:449
  • bookcollection:library_of_congress
  • bookcollection:americana
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27 July 2014
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