. The elements of railroad engineering . te. Figure 36 isa spring rail frog. Themovable wing rail is heldagainst the frog point bysprings at S, thus givingcontinuous main flange of a wheel ofa car taking the siding orcoming from the sidingthrows the spring rail overand passes through, thespring bringing the wingrail back at once after thewheel has passed. Frogs are known by theirnumber, which is the lengthfrom point to heel dividedby the heel spread. Gen-erally the length is takenalong the middle line, mak-ing the number equal halfthe co-tangent of half thefrog angle. Some makersuse
. The elements of railroad engineering . te. Figure 36 isa spring rail frog. Themovable wing rail is heldagainst the frog point bysprings at S, thus givingcontinuous main flange of a wheel ofa car taking the siding orcoming from the sidingthrows the spring rail overand passes through, thespring bringing the wingrail back at once after thewheel has passed. Frogs are known by theirnumber, which is the lengthfrom point to heel dividedby the heel spread. Gen-erally the length is takenalong the middle line, mak-ing the number equal halfthe co-tangent of half thefrog angle. Some makersuse the length along thegauge side, in which casethe number equals half theco-secant of half the frogangle. Expressed as equa-tions, n=^ cot I F, Fig. 36 w = i cosec There arc many patterns of frogs and switches and devices foroperating them, and the student is referred to frog-makers catalogs DOUBLE TURNOUTS 85 for further details and patterns; he may gain much information bystudying the turnout details in any depot yard of his own city or. Set for Siding Fig. 37 Set for Main Line
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
