. Railway maintenance engineering, with notes on construction . 1 V 6H I ■X y » ° 13 = bit X^ ^ffii^r I J .1 Lag Screw for Bridie Plate. fht^Vtasher-i^A^^i^. Bridle Plate. (^ WJ idle Plate for Switches, 100 lbs Rails Insulated Joint Fig. 77.—Switch, Pennsylvania Railroad Fibre Collar Fibre Washer. To face page 138. OTHER TRACK MATERIAL 139 to be about the minimum for the use of standard angle barson the inside of the joint; where a heel block is employed, however,there is no good reason why the flangeway cannot be reducedto 2| ins. giving a heel distance for 100-lb. A.S.C.E. rail of 5fins. It
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. Railway maintenance engineering, with notes on construction . 1 V 6H I ■X y » ° 13 = bit X^ ^ffii^r I J .1 Lag Screw for Bridie Plate. fht^Vtasher-i^A^^i^. Bridle Plate. (^ WJ idle Plate for Switches, 100 lbs Rails Insulated Joint Fig. 77.—Switch, Pennsylvania Railroad Fibre Collar Fibre Washer. To face page 138. OTHER TRACK MATERIAL 139 to be about the minimum for the use of standard angle barson the inside of the joint; where a heel block is employed, however, there is no good reason why the flangeway cannot be reducedto 2| ins. giving a heel distance for 100-lb. A.S.C.E. rail of 5fins. It will be noticed that in the Pennsylvania switch a specialinside splice is used with a heel distance of 5| ins. The point of the switch is protected by the bend in the stockrail, but is nevertheless exposed to considerable wear. The useof manganese points is to be commended in places where the. Fig. 78.—^Economy Switch Point. ordinary steel will not stand the traffic. Manganese steel, whilelittle used for rails on steam roads, is employed largely and withexcellent results for switches and frogs. In yards where the points wear rapidly on account of theconstant switching on the ladder tracks the ^^ Economyseparable switch points shown in Fig. 78 have given very goodresults. These points are cast of a special alloy and being madeof a tough material will wear to a thin edge. The Wharton switch, illustrated in Fig. 79, is a good exampleof a switch which does not require the main line to be broken. 140 RAILWAY MAINTENANCE These switches have to be taken at slow speed, and are onlyapplicable in cases of side tracks that are not used frequently. In entering the switch the portion of the tread of the insidewheels overhanging the head of the main rail is lifted up anincline by the elevating switch rail until the flange of the wheelcan pass over the head of the main rail; the switch