. Railway track and track work . rs by %-in. hook 158 TRACK. bolts. The four guard timbers are 6 ins. wide and 8 ins. high, the innerones 4 ins. from the rail and bolted to alternate ties, while the outer ones-are 11 ins. from the gage side of the rail and are bolted to every between the tracks, or in some places on the outer side, aretimbers 6x6 ins., carrying four lines of plank 2x6 ins., forming a walkfor the trackmen and employees. The outer walks are usually protected bygas pipe hand rails. The line is operated by electricity, the third rails (notshown) being carried on insu
. Railway track and track work . rs by %-in. hook 158 TRACK. bolts. The four guard timbers are 6 ins. wide and 8 ins. high, the innerones 4 ins. from the rail and bolted to alternate ties, while the outer ones-are 11 ins. from the gage side of the rail and are bolted to every between the tracks, or in some places on the outer side, aretimbers 6x6 ins., carrying four lines of plank 2x6 ins., forming a walkfor the trackmen and employees. The outer walks are usually protected bygas pipe hand rails. The line is operated by electricity, the third rails (notshown) being carried on insulators just outside of and a little above theouter guard timbers. In some cases ties have been dispensed with, andeach line of rails rests on wooden blocks or saddles riveted between a pairof channels placed close together and acting as guard rails. This system wasoriginally used on the Hoboken line, but when the company began runningits electric surface cars over the line, cross ties were substituted, resting \ Station Platform. I Fo ChordLsU|[*Av % Fig. 94.—Track and Floor System; South Side Elevated Electric Ry. (Chicago). on the channel stringers. This was partly on account of the attachmentsallowing too much lateral play of the rails to suit the narrow tired wheels,and partly because the gear cases came too near the stringers. The KansasCity line has 48-ft. pin-connected trusses with top chords of two , 8 ins. apart, having bent steel plates riveted between their websat intervals of 16 ins. The rails were originally laid directly on these plates,but this arrangement caused considerable noise and the rails are nowspiked to ties laid across the chords in the usual way. It has been pro-posed to lay longitudinal timbers in a similar way to the above, givinggreater security than the blocks, and less obstruction to light than the BRIDGE FLOORS AND GRADE CROSSINGS. 159 ties. The latter point is important for lines
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
