Turnout of Similar Flexure

A turnout of similar flexure (Fig. 15.1) is one that continues to run in the same direction as the main line curve even after branching off from it. The degree of the turnout curve is higher than that of the main line curve. The degree and radius of the turnout curve are given by the formulae

where Ds is the degree of the outer rail of the turnout curve from the straight track, Dm is the degree of the rail of the main track on which the crossing lies, i.e., the

inner rail in Fig. 15.1, Dt is the degree of the rail of the turnout curve on which the crossing lies, i.e., the outer rail, Rs is the radius of the outer rail of the turnout curve from the straight track, and Rt is the radius of the rail of the turnout curve on which the crossing lies, i.e., the outer rail.

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