File:Image from page 369 of "The Street railway journal" (1884) (14758607755).jpg

Identifier: streetrailwayjo161900newy 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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Text Appearing Before Image: in position. This construction haslittle to recommend it. It is evident that the metal used isbadly distributed to give good results and a long life. Ithas the convenience of being able to separate the rails ona curve, so as to give without any special rail a widergroove, and also that the grooves do not pack hard with cutting to length and to the drilling of the rails, and to thelimiting variations which will be permitted from the speci-fied dimensions. The carbon is seldom specified, but in itsplace is the resistance of the metal in tension. Some yearsago the mills gave from 50 to 55 kilos, per square milli-meter as the extreme limits, but these rails were much toosoft, and they wear down in use very rapidly. But nowunder a little pressure the manufacturers are accepting 65to 70 kilos., and even to 75 kilos. These rails are verysatisfactory. Fig. 10 is a cross section of the early track construction,with the rails laid directly on the earth or on a prepared lp-140-jn-straigh-t-track

Text Appearing After Image: T-H Rail: weight 48 kilos, permeter (96 lbs. per yard). 50 >! -2i0- Slm-I Ry.Journul FIG. 3.—SECTION OF MARSILLON RAIL AND CHAIR dirt, as with the ordinary grooved rail. Actual trials aresaid to have given lower traction coefficients with this rail.This form of rail is rapidly disappearing, and before manyyears it will probably be completely replaced by othertypes. 3. Girder rails are all of the full-grooved type, nothingelse being permitted. Most of those in use are of Frenchmanufacture. Fig. 5 gives the sections of the principaltypes of girder rails rolled by the two mills in France whichhave taken up their manufacture. The first one shown iscalled the T-H section, and for this Fig. 6 shows thesplice bars, and Fig. 7 the tie-rods. Fig. 8 shows the tworails tied together. It will be observed that this construc-tion of tie-rod. while a very good one, requires that theyshould be made very accurately to the required length, soas to keep the track properly gaged. Fig. 9 shows thespa

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