. Railway track and track work . rom main rail to ....L ....N ....P ....R Distance, frcg point to ...KM KMO KMOQ KMOQS Rigid. 69° 82 5V2 ins. 15 ft. 56 ft. 43,4 ins. 41 4% 20° 26 5l/2 ins. 1 ft. 7% ins. 3 4% 4 3 3 0 11 4% 26 ■ m 41 4% Spring. Spring. Spring. 8 10 12 7° 10 5° 44 4° 47 5% ins. 5% ins. S1/^ ins. 15 ft. 15 ft. 15 ft. 65 ft. 6% ins. 76 ft. 8Vo ins. 86 ft. 9 ins. 50 6% 61 8% 71 9 12° 38 7° 20 4° 43 10% ins. 8% ins. 7 ins. 2 ft. 4% ins 1 ft. 7 ins. 1 ft. 10 ins 3 ey2 2 9i/s 2 1014 3 1% 3 8 4 3 4 3 4 3 7 6 7 6 7 6 20 6 16 8% « 23 9 35 6 31 8% 39 9 46 8% 55 9 50 6
. Railway track and track work . rom main rail to ....L ....N ....P ....R Distance, frcg point to ...KM KMO KMOQ KMOQS Rigid. 69° 82 5V2 ins. 15 ft. 56 ft. 43,4 ins. 41 4% 20° 26 5l/2 ins. 1 ft. 7% ins. 3 4% 4 3 3 0 11 4% 26 ■ m 41 4% Spring. Spring. Spring. 8 10 12 7° 10 5° 44 4° 47 5% ins. 5% ins. S1/^ ins. 15 ft. 15 ft. 15 ft. 65 ft. 6% ins. 76 ft. 8Vo ins. 86 ft. 9 ins. 50 6% 61 8% 71 9 12° 38 7° 20 4° 43 10% ins. 8% ins. 7 ins. 2 ft. 4% ins 1 ft. 7 ins. 1 ft. 10 ins 3 ey2 2 9i/s 2 1014 3 1% 3 8 4 3 4 3 4 3 7 6 7 6 7 6 20 6 16 8% « 23 9 35 6 31 8% 39 9 46 8% 55 9 50 6 61 8% « 71 9 *Measured along the rail. To set out the turnout curve, stretch a cord from the theoretical point offrog (as measured from K. Fig. 214, diagram 215, and marked on rail), tothe point of curve Q C or R C, allowing for proper spread of switch rail this distance into four parts, and (for standard gage) set off a mid-dle ordinate of 1,177 ft. and two side ordinates of ft. From each of these. l?1* £3II ||£ ^■MlliJiaili Fig. 216.—Method of Putting in a Split Switch withoutCutting Rails; Southern Pacific Ry. points, and from the frog point and point of turnout, measure half the gage,which will give five points on the center line of the turnout curve. Eachside ordinate is % of the middle ordinate. At the middle point of the leadthe offset from main rail to turnout rail (gage to gage) is always % thegage, and at the quarter points it is 1-16 and 2-16 the gage, whatever may bethe frog number, length or lead, or whether the turnout is from a tangentor curve. The degree of the turnout curve is 600 divided by the square ofthe frog number (approximately) when the turnout is from a tangent, andthis, plus or minus the degree of main curve gives the degree when theturnout is from the inside or outside of a main line curve. The middle or-dinate for bending 30 ft. rails is 12 ~- square of frog number more (or less)than the main curve ordinate, and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
