Track & Roadbed

Frog

The X-shaped component of a turnout where the diverging rails cross.

Full Definition

The frog is the critical component of a turnout where the inner rails of the diverging routes cross each other, forming an X shape. Frogs can be 'live' (powered, maintaining electrical contact) or 'dead' (insulated, creating a brief power gap). Live frogs (electrofrog) provide better electrical continuity but require careful wiring.

Examples

•A #6 frog diverges at a ratio of 1:6
•Electrofrog turnouts require additional wiring but improve operation

Tips & Best Practices

Keep frogs clean for reliable operation - this is a common trouble spot

Related Terms

Turnout

A track arrangement allowing trains to switch from one track to another; also called a switch or points.

Points

The movable rails in a turnout that direct trains to the diverging or through route.

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