. The trackman's helper, a handbook for track foremen, supervisors and engineers . Fig. 55. Typical Guard Rail from the main rail at the point where the switch railstarts to curve toward the frog, and where this is atthe end of planing it will be equal to the width of arail head, or about of a ft. The column headed^^G is the gage of the track minus the spread of toeof the frog and the spread of the switch rail at heelor end of planing. The other columns are explainedby their captions in the table. fTrue PointBlunt Point. Standard Frog Frogs. Fig. 56 is an outline diagram of a tri
. The trackman's helper, a handbook for track foremen, supervisors and engineers . Fig. 55. Typical Guard Rail from the main rail at the point where the switch railstarts to curve toward the frog, and where this is atthe end of planing it will be equal to the width of arail head, or about of a ft. The column headed^^G is the gage of the track minus the spread of toeof the frog and the spread of the switch rail at heelor end of planing. The other columns are explainedby their captions in the table. fTrue PointBlunt Point. Standard Frog Frogs. Fig. 56 is an outline diagram of a triangle C A E is the tongue. C E is the heel ofthe tongue. The channel at K is the mouth. Its nar-row part, P H, is the throat. The wings, F G, andH I, support the treads of the wheels from the pointB, to the throat. L M is the heel of the frog. The 266 THE TRACKMANS HELPER angle is the divergence of the lines, A C and A intersection of the lines at A is the true the-oretical point of the frog. As this point is too weakfor service, it is rounded off where the tongue is aboutone-half inch wide. The frog number is the ratio ofthe perpendicular, A D, the length of the point to thebase, C E. Thus, if the length, A D, be 7, 9 or 10times C E, the frog is called a No. 7, 9 or 10 angle of the frog is determined approximately bydividing 57%o degrees by the number of the get the number of a frog one of the following waysmay be used: 1. Take a short stick say six inches long, lay this on
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