. Railroad construction. Theory and practice . Fig. 145. apparent when it is considered that the middle switch may beregarded simply as a curved main track, and that, as developed I §271. SWITCHES AND CROSSINGS. 283 in § 267, the dimensions of turnouts are nearly the same whetherthe main track is straight or slightly curved. 271. Connecting curve from a straight track. The con-necting curve is the tracklying between the frog and q ^the side track where it be-comes parallel to the maintrack (FS in Fig. 146 or 147).Call d the distance betweentrack centers. The angleFO,R=F (see Fig. 146).Call / t

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. Railroad construction. Theory and practice . Fig. 145. apparent when it is considered that the middle switch may beregarded simply as a curved main track, and that, as developed I §271. SWITCHES AND CROSSINGS. 283 in § 267, the dimensions of turnouts are nearly the same whetherthe main track is straight or slightly curved. 271. Connecting curve from a straight track. The con-necting curve is the tracklying between the frog and q ^the side track where it be-comes parallel to the maintrack (FS in Fig. 146 or 147).Call d the distance betweentrack centers. The angleFO,R=F (see Fig. 146).Call / the radius of the con-necting curve. Then. {r-hg) = vers F . (107) FR = {r-^g)^mF, Fig. 146. (108) If it is considered that the distance FR consumes too muchtrack room it may be shortened by the method indicated inFig. 151. 272. Connecting curve from a curved track to the the main track is curved, the required quantities are the

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