. The Street railway journal . ctions of the different types. In preparingthis outline, allowance has been made for the variationswhich will necessarily occur in the alignment with respectto the gage line of the track and in the elevation with re-spect to the top of the track rail. These variations occur, due to the wear of the railhead and to the fact that therail may be deflected fromweight of passing equipment,between those ties which sup-port the third-rail, withoutequal deflection of the cause for variations isthe wear which takes place inthe tie, lowering the track railwit
. The Street railway journal . ctions of the different types. In preparingthis outline, allowance has been made for the variationswhich will necessarily occur in the alignment with respectto the gage line of the track and in the elevation with re-spect to the top of the track rail. These variations occur, due to the wear of the railhead and to the fact that therail may be deflected fromweight of passing equipment,between those ties which sup-port the third-rail, withoutequal deflection of the cause for variations isthe wear which takes place inthe tie, lowering the track railwithout a corresponding lower-ing of the third-rail. It shouldtherefore be understood thatthe line A-B-C-D-E-F-G-H-I-J-K is the line beyond whichthe third-rail structure shall inno case extend, all variationsin the third-rail with respect tothe base line (top of rail andgage of track) being included. The line K-A-B-C, the lim-iting line for rolling stock, hasbeen plotted by allowing y2 clearance between this-20 ?r 1—. Street Railway Journal LONG ISLAND RAILROAD, TOP CONTACT, THIRD-RAIL TYPE (THIRD-RAIL INSULATORSSPACED 10 FT., CENTER TO CENTER) line and the limiting line of third-rail structure, and it isconsidered that rolling equipment should under no condi-tions of wear or distortion due to broken springs, etc., ex-tend beyond this line. ,As the third-rail contact shoe is carried on the truck,which has usually a very short wheel base, the distance fromthe end of the shoe to the gage line of the track is not ap- November 9, 1907.] STREET RAILWAY JOURNAL. 955 preciably affected by curvature of the track, and it is there-fore not possible to place the third-rail structure at an ap-preciably greater distance from the gage line of the trackon curves than on tangent track. It should therefore beunderstood that the line K-A-B-C is the limiting line forrolling equipment on curved as well as tangent track. Al-lowance in equipment clearance, however, should be madefor curved
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
