. The science of railways . Fig. 126. MOVABLE POINT CROSSING. ing the levers at the movable point with theswitch stand. The Coughlin switch rail frog isdesigned to leave the main line track unbrokenat the frog, there being no guard rail or frogrequired for the main line. The principle of thisspring rail frog is in use on the Lehigh ValleyRailway and Western Maryland Railway. Itcan be used with the split switch or Whartonpoints. The spring rail frog used with theMcPherson improved safety switch accomplishesthe same object that the Coughlin switch railfrog does, except that a guard rail is requi
. The science of railways . Fig. 126. MOVABLE POINT CROSSING. ing the levers at the movable point with theswitch stand. The Coughlin switch rail frog isdesigned to leave the main line track unbrokenat the frog, there being no guard rail or frogrequired for the main line. The principle of thisspring rail frog is in use on the Lehigh ValleyRailway and Western Maryland Railway. Itcan be used with the split switch or Whartonpoints. The spring rail frog used with theMcPherson improved safety switch accomplishesthe same object that the Coughlin switch railfrog does, except that a guard rail is requiredon the main line track. On account of the varying angles at whichroads cross each other, crossing frogs have to beespecially made in each instance. They are madeof steel rails cut to length and shape, and fitted 232 BUILDING AND REPAIllING Fig. 129. CROSSING PROGS. ANGLES 60° TO 90°. and strongly bolted together. Fig. 129 representsone type of crossing frog; the rails butt againsteach other and are solid filled throughout, and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
