File:Electric railway journal (1913) (14575141307).jpg

Identifier: electricrailway421913newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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them are using treated ties. Some engineershave taken the position that the life of the tie should not visability of using hewn or sawn ties either treated oruntreated, and the problem still remains an open one.Doubtless for treated ties sawn timber will give betterpenetration in the treating process than hewn ties. Whena stick of timber is squared the saw does not follow thegrain but leaves the pores open to receive the preservativeunder either the pressure process or the dipping or paint-ing process. To verify this statement one needs only tocut into a sawn tie and a hewn tie treated by the sameprocess, and it will be found that the penetration in thesawn tie is much deeper than that in the hewn tie. Thefact that a better rail bearing is obtained without adzingis another argument in favor of sawn ties. To provide anequal bearing area on hewn ties it is necessary either toadze them by hand after the rail is set in position, justbefore it is spiked, or do the surfacing with an adzing
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Girder Grooved Rail with Combination Granite Block and Asphalt Paving, United Railroads of San Francisco exceed the life of the rail. Consequently they haveadopted ties which will give this length of life in service,and usually the kind of timber selected is that most plenti-ful in the territory in which the street railway companysproperty is situated. On the other hand, some engineershave used treated soft wood, only to find its life limitedby mechanical wear. Consequently they have abandonedits use, adopting a more expensive untreated timber whichwill give the same length of service. Where the selectionof the kind of tie to be employed is not governed byeither of these factors and the engineer is free to ap-proach the problem with an open mind, he usually adoptseither the treated hard wood or the white oak tie. Ineither case he is careful to see that the timber is properlyseasoned before it is treated or before it is placed in thetrack. If the tie is untreated, usually the specifica

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