. Railway track and track work . e of outer switches on the sharp right-angled curves of the Chicago elevated loop, 1 rail is place! close to the stock rail on the side of the curve, and is extendedback of the point of the switch rail. When the switch is set for the ijurve, theswitch rail lies against the rail and is thus ftrmly supported to resist theblows from the wheel flanges in taking the curve. The Channel switch, Fig. 53, SWITCHES AND FROGS. 115 has a guard rail about 9 ft. long, bolted to the inside of each switch rail, with theproper flangeway provided by spaci
. Railway track and track work . e of outer switches on the sharp right-angled curves of the Chicago elevated loop, 1 rail is place! close to the stock rail on the side of the curve, and is extendedback of the point of the switch rail. When the switch is set for the ijurve, theswitch rail lies against the rail and is thus ftrmly supported to resist theblows from the wheel flanges in taking the curve. The Channel switch, Fig. 53, SWITCHES AND FROGS. 115 has a guard rail about 9 ft. long, bolted to the inside of each switch rail, with theproper flangeway provided by spacing blocks. The flaring ends of the guardrails extend beyond tl\e switch rails, and have the head rod attached to them. If very heavy switch rails were bolted up tight at the heel splices, they wouldnot move freely. In the 100-lb. switches of the Southern terminal at Boston,two of the bolt holes in each rail are reamed out to 1| ins., and a heavy gas-pipethimble is put over the bolt through the rail. The thimble is long enough to. iQ UUUUUUUUU Section 53.—Channel Switch. take the pressure on the angle bar and prevent [iinching the rail. This allowsthe switch to move freely and yet leaves no loose nuts. The spread of the railsat the heel is often a little too wide, but the Bryant device used in split and slipswitches and movable-point frogs at the above-mentioned terminal insures theproper spread and also prevents creeping of the switch rails. It of asplice trough or channel, 10 ins. long and 3 ins. wide, made of varying width tofit the angle Ijetween the rails. This is bolted between the angle bars of adjacentrails, or between the web of the stock rail and the splice bar of the heel lugs are sometimes bolted to the web of the switch rails, about 7 ft. to10^ ft. from the point, so as to bear against the web of the stock rail when the
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