File:The Street railway journal (1907) (14573590179).jpg

Identifier: streetrailwayjo301907newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ypes of track construction have been adopted by theboard of supervising engineers for use under different con-ditions. Although these have been practically standardized,a few minor changes are to be made in them, so the boardhas decided not to make public the details of the differenttypes. At the some time, the general features of the latterhave been supplied to this journal. A standard girder rail,the cross-section of which is shown on page 844, is usedin all three types. In one type the rails are laid on steelcross-ties, imbedded in concrete, and in the other two onwooden cross-ties, also imbedded in concrete; the differencebetween the two types in which wooden cross-ties are usedappears largely in the construction of the sub-base on whichthe track is laid. The steel ties are of the standard 4^-in. Carnegie girdersection. They are placed on a heavy sub-base of concreteand are imbedded in a layer of concrete, which is continued2V2 ins. above the base of the rails. In some of the work
Text Appearing After Image:
CONCRETE MIXING OUTFIT USED IN PLACING TRACK SUBSTRUCTURE that has been dane these ties were spaced 5 ft. apart oncenters, but in most cases they are 4 ft. apart on centers,and it is probable that the shorter spacing will be adoptedas the standard. Sawed wooden ties, 6 ins. x 8 ins. in crosssection and 7 ft. or 8 ft. long, are used. They are also im-bedded in a layer of concrete, which for one type of trackis laid on a sub-base of crushed stone, and for the other ona sub-base of concrete. These ties are spaced 4 ft. oncenters. The chief feature of all of the track construction is thatthe sub-structure is designed to be unusually permanent,and is built so the rails may be renewed with comparativelylittle difficulty and without disturbing the sub-structure.Tie plates are used on both the steel and the wooden cross-ties. The rails are attached to the steel ties by a clip, whichcan be removed and replaced readily, and which was de-signed for use in connection with this work. Screw spikesa

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