The primary function of the switch rails in a turnout is to:
Guide wheels from main line to turnout line
A railway turnout consists of switch rails, lead rails, and the crossing (frog). The switch rails (tongue rails) are the movable tapered rails that can be shifted laterally. When a switch rail moves toward the stock rail on the turnout side, it deflects the wheel flanges and guides the wheels from the main line onto the branch/turnout line. They are the primary route-changing component of the turnout.
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