. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . F,T=^.^^-g cot F,.sm J^. ^ (117) 294 RAILROAD CONSTRUCTION. § 274. The total distance along the track may be derived as follows:DV= 2DF, + F,Y= 2DF, + XT- XF,-,XY= {d - g) cot F,; XF, = g-T-smF,; ... DV = 2I)F, + {d-g) cot F,-^^^. . (118)If a reversed curve with equal frogs is used, we have vers 6 = d also 2^, ..... (119)DQ = 2/sin 0. . . (120). Fig. the frogs are unequal, we will have (see Fig. 152) r, vers 6 -\- r^ vers 6 =^ d\ vers 6 d + ) • • •
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . F,T=^.^^-g cot F,.sm J^. ^ (117) 294 RAILROAD CONSTRUCTION. § 274. The total distance along the track may be derived as follows:DV= 2DF, + F,Y= 2DF, + XT- XF,-,XY= {d - g) cot F,; XF, = g-T-smF,; ... DV = 2I)F, + {d-g) cot F,-^^^. . (118)If a reversed curve with equal frogs is used, we have vers 6 = d also 2^, ..... (119)DQ = 2/sin 0. . . (120). Fig. the frogs are unequal, we will have (see Fig. 152) r, vers 6 -\- r^ vers 6 =^ d\ vers 6 d + ) • • • also the distance along the track B^N = {r, + n) sin 6. . , (121) (122) 275. SWITCHES AND CROSSINGS. 295 275. Crossover between two parallel curved tracks, (a) Usinga straight connecting curve. This solution has limitations. Ifone frog (i^,) is chosen, i<\ becomes determined, being a functionof i^j. If F^ is less than some limit, depending on the width
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