. Railroad structures and estimates . Fig. 7. Rigid Frog. The bolted type of frog is generally used, with spring rail frogsfor main line turnouts where siding traffic is relatively small. TRACK MATERIAL. 19 Main line frogs are usually 9 to 12 and for yards 6 to 9, width offlangeways for frogs and guard rails If to If inches. Foot guards are used in the angle of frogs, heel of switches and endsof guard rails to protect employees from getting their feet caught. The frog number is the proportion of its length into its breadthor spread. Frog angle = cb -s- {ab + cd).. Example. — ab = 4 inches, cd
. Railroad structures and estimates . Fig. 7. Rigid Frog. The bolted type of frog is generally used, with spring rail frogsfor main line turnouts where siding traffic is relatively small. TRACK MATERIAL. 19 Main line frogs are usually 9 to 12 and for yards 6 to 9, width offlangeways for frogs and guard rails If to If inches. Foot guards are used in the angle of frogs, heel of switches and endsof guard rails to protect employees from getting their feet caught. The frog number is the proportion of its length into its breadthor spread. Frog angle = cb -s- {ab + cd).. Example. — ab = 4 inches, cd = 8 inches, be = 84. 84 -f-(8 inches + 4 inches) = 7. Angle or spread of frog is 1 in 7, orNo. 7 frog. TABLE FOR PUTTING IN FROGS AND * Gauge 5 Throw. Number offrog. Length of frog. Ft. Angle offrog. Radius of curve. Ft. Split switch leads dis-tance AB for 15 5 5 11° 25 239 50. 6 6 9° 32 345 7 7 8° 10 431 8 8 7° 10 606 9 9 6° 21 764 10 ■ 10 5° 44 919 11 11 5° 12 1096 12 12 4° 46 1246 The split switch lead on tangents is the distance from the switchpoint to the frog point measured along the straight track.
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