. Elements of railroad track and construction . traight track, the center of the turnoutcurve being at 0. The gauge line is the projection of the inside face ofthe head of the rail, the rails in the figure being repre-sented by their gauge lines. The gauge of tracks g, is the distance between gauge linesof the rails of a track. The point of switch is the point A, also C, at which theturnout curve begins or is tangent to the main rail. The leaHy 1, is the distance A B from the point of switchto the point of frog. The frog distance is the distance C B from the pointof switch on the outer rail to
. Elements of railroad track and construction . traight track, the center of the turnoutcurve being at 0. The gauge line is the projection of the inside face ofthe head of the rail, the rails in the figure being repre-sented by their gauge lines. The gauge of tracks g, is the distance between gauge linesof the rails of a track. The point of switch is the point A, also C, at which theturnout curve begins or is tangent to the main rail. The leaHy 1, is the distance A B from the point of switchto the point of frog. The frog distance is the distance C B from the pointof switch on the outer rail to the point of frog. The point of frog is at the intersection of the guagelines at B. The switch-point rails^ or switch points, S, are the partsAKandCG. The stub lead is the distance B H from the heel of theswitch points to the point of frog. The throw of the switch, t, is the distance between TURNOUTS. 95 gauge lines at the heel of the switch points, E G andHK. The radius of the turnout, r, is the radius of the centerline of the turnout Fig. 62. The frog angle, F, is the angle between the gauge linesat B. The frog number is the ratio of the distance B P^ Fig. 63,to the distance M N, B P being the distance from thepoint of frog to any point P, and M N being the distance
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