. The trackman's helper, a handbook for track foremen, supervisors and engineers . ties in a three-throw switch is found bydoubling the set for a single turnout, and subtractingthe length of the standard cross tie. When puttingthem in the track, measure the length of each tie anddraw a chalk line across the middle; mark also the 276 THE TRACKMANS HELPER middle of the gage. Lay the gage on the maintrack, and as each tie is put nnder the track, see thatthe chalk mark across the middle of the tie comes di-rectly under the middle of the gage of the maintrack. The approximate number of the middle o
. The trackman's helper, a handbook for track foremen, supervisors and engineers . ties in a three-throw switch is found bydoubling the set for a single turnout, and subtractingthe length of the standard cross tie. When puttingthem in the track, measure the length of each tie anddraw a chalk line across the middle; mark also the 276 THE TRACKMANS HELPER middle of the gage. Lay the gage on the maintrack, and as each tie is put nnder the track, see thatthe chalk mark across the middle of the tie comes di-rectly under the middle of the gage of the maintrack. The approximate number of the middle orcrotch frog is found by multiplying the number ofthe side frogs by the decimal .707, or by adding thenumbers of the two side frogs together and dividingby Derailing switches. Fig. 58 illustrates a methodof derailing cars and is used in cases where precau-tions are required to prevent cars from accidentallyrunning out of the siding upon the main track. Whenputting in this derailing switch, drive a row of spikesagainst the inside flange of the rail, C, when set for C/efiny. /*fa/n Fiff. 58 derailing and place rail braces on the outside to sup-port and keep the rail in place when set for movementto the main track. It is good policy to use sound oakties, spaced not more than eight inches apart underthe moving rail. This presents a smoother surfacefor the derailed cars than ties spaced in the ordinaryway, and prevents the wheels from sinking betweenthem. In setting up switch-stand, have the target showdanger when the switch is set for derailing. FROGS AND SWITCHES 277 Turnouts from curves. In turnouts from curves,the lead distance is practically the same as in turn-outs from a straight track. The degree of curve ofthe turnout is approximately increased by the degreeof the main track curve, when the turnout is withthe curve; and decreased by the degree of the maintrack curve, when the turnout is against the turnouts against curves, when the degree of themain track cur
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