File:Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools (1917) (14573469050).jpg

Identifier: railroadconstruc05webb (find matches)
Title: Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools
Year: 1917 (1910s)
Authors: Webb, Walter Loring, 1863- (from old catalog)
Subjects: Railroads
Publisher: New York, John Wiley & sons, inc. (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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possible to estimate the probable life of these ties.Until a reasonably close estimate of the life of steel ties canbe determined, no proper comparison can be made of theireconomy relative to that of wooden ties. A study of TableXVIII will show that a tie which costs, say three times as muchas a cheap tie, must last more than three times as long in orderthat the annual charge against the tie shall be as low as that ofthe cheaper tie. For example, let us assume that the cost of ametal tie, laid in the track, is $2.55 and that it will last 20 years.From Table XVIII we may find that the annual charge against$2.55 at 5% for 20 years = (2 X8.02) +4.41 =20.45 cents. Com-pared with a tie costing 65 cents, plus 20 cents for track laying,we find that the cheaper tie will only cost 19.63 cents per yeareven if it only lasts 5 years. Of course the claimed advantageof better track and less cost for track maintenance, using steelties, will tend to offset, so far as it is true, the disadvantage of I
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L1VE5EY BOWL, OaflO Plate VI.—Some Forms of Metal Ties.iBelween pp. 292 and 293.) § 261. TIES. 293 the extra cost of the metal tie. Even if the extra work per tieamounts to only one-half hour for one man in a year, the cost of it,say 6 cents, will utterly change the relative economics of the twoties. 261. Fastenings, The devices for fastening the rails to theties should be such that the gauge may be widened if desired oncurves, also that the gauge can be made true regardless of slightinaccuracies in the manufacture of the ties, and also that shimsmay be placed under the rail if necessary during cold weatherwhen the tie is frozen into the ballast and cannot be easilydisturbed. Some methods of fastening require that the base ofthe rail be placed against a lug which is riveted to the tie orwhich forms a part of it. This has the advantage of reducingthe number of pieces, but is apt to have one or more of thedisadvantages named above. Metal keys or wooden wedges aresometimes used, but t

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