. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . e rails at various speeds. The following were the resultsobtained by the passage of a train in which the weights were: Tons. Cwt. Locomotive, running Tender Total weight of six carriages. 46 33 12 1218 7f Speed of Train. Vertical Deflection. Miles per Hour. The depression of the tie in the ballast is very erratic. Table LIX showsthat in the tests made by the United States government on the depression
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . e rails at various speeds. The following were the resultsobtained by the passage of a train in which the weights were: Tons. Cwt. Locomotive, running Tender Total weight of six carriages. 46 33 12 1218 7f Speed of Train. Vertical Deflection. Miles per Hour. The depression of the tie in the ballast is very erratic. Table LIX showsthat in the tests made by the United States government on the depression of * Tlio Devolopmont of lh(> Manufacttiro and XTso of Rails in Ciroat Britain, Bell. ProceeiInst, of Civil Engrs., Vol. CXLll, April, 1900, p. 133. SUPPORTS OF THE RAIL 191 rails the mean depression, under the drivers of an engine having axle loads of 44,000 pounds, was as follows: 60-pound rail 073-inch deflection 70-pound rail 138-inch deflection 85-pound rail 233-inch deflection All of these depressions were obtained in gravel ballast with static wheel loads and give results the reverse of what might have been STAND FASTENED TO A SLEEPERBEDDED IN THE SAU-AST Fig. 141. — Bells Apparatus for Measuring Depression of the Track. Fig. 142 shows the relation of the depression to the pressure on the dotted lines give Zimmermans coefficients 3 and 8 and the dash line thatsuggested by Freemans discussion in Article 21. These curves are straight LOAD PER LINEAR INCH UNDER ONE LINE OF RAILS(TIES SPACED 20IN) TONS (2000 LBS) O o roO O wO o o 2 o(/I n 5 o en O ,___ . _ _ _ - - . . - b. ^ * *. L =.^1 --=., ^^ I § ^ ~_ CCta \ ^- ~^^Z:^^, : : : _ ;_ -5.^ ^*^>£ 3-2- ■ t7 ^- - 2>_i. s ^ >^c , _ :_ 4i^5v !^---:^S :: ± .is^v* -- -_::--, it c^ -^ ji 2^^;^ - _ - : -- -\ 55^^v -jt ^;>^s -i^ ± C^^^^Si. X • v.^^^i T H^^^^^S^ \ ^^ ^Z^^ -- _\,^ 1,^ ; ---*--- = --= =:::-7 ^v^^ ~- ~ 1 ^ » -^i- w i. ■~v^ 5. ^^ :: -_ _ ^» i ». -I : -^s >, i ^s
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Keywords: ., bookcentury1900, bookdecade1910, bookidsteelrailsth, bookyear1913
