. Railway track and track work . adelphia & Read-ing Ry., where the four-track line diverges to form two double-track lines,there are slips 112 ft. long, having No. 15 frogs and 28-ft. switch rails, so asto give easy and safe passage for high speed trains. Three-Throw Switches.—In some cases, two turnouts diverge at the samepoint, requiring a crotch frog in the middle of the track, where the leadrails intersect. When permissible, it is better to set one switch a little inadvance of the other, thus keeping the switch rails distinct, though this ar-rangement throws the crotch frog off the center
. Railway track and track work . adelphia & Read-ing Ry., where the four-track line diverges to form two double-track lines,there are slips 112 ft. long, having No. 15 frogs and 28-ft. switch rails, so asto give easy and safe passage for high speed trains. Three-Throw Switches.—In some cases, two turnouts diverge at the samepoint, requiring a crotch frog in the middle of the track, where the leadrails intersect. When permissible, it is better to set one switch a little inadvance of the other, thus keeping the switch rails distinct, though this ar-rangement throws the crotch frog off the center line of the main plans are shown in Pig. 53. Wharton Switch.—This type of switch gives an unbroken track when setfor the main line, as in Pig. 54, while when set for the siding, it carries thewheels over the head of the stock rail by means of inclined rails. Whenset for the siding, the grooved switch rail (A), 8 or 9 ft. long, raises theouter wheels 1% ins. above the main rail, its heel bringing them upon the. Two Single Split Switches. Three-Throw Split Switch. Fig. 53.—Three-Throw Switches. raised lead rail of the turnout. At the same time, the elevating rail (B) onthe outside of the main track, engages the outside of the treads of the innerwheels and raises them in the same way. If trailed through from the sid-ing when set for the main track (as in Fig. 54) the wheels run upon groovedcastings (C) and (D), the latter of which guides the inner wheels over themain rail, when the flanges drop into place. If trailed through on the maintrack when set for the siding, the wheels open the switch by forcing back SWITCHES AND FROGS. 109 the pivoted guard rail (E), which rests against the main rail and is con-nected with the operating shaft (F) of the switch. The inside guard rail(GO should he net mere than 2 ins. from the main rail, so as to force thewheels to mount the elevating rail (B) and keep them in position until theflanges have cleared the main rail. The eleva
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
