Which term refers to an electrified rail located alongside and above the inner/near running rail from which a sliding contact shoe collects power?

• A. Rail Return
• B. Third Rail Gap
• C. Third Rail Warning Device
• D. Third Rail

Answer: (D)

A third rail is the electrified conductor placed alongside and slightly above the near running rail from which a sliding contact shoe collects power. The shoe on the train slides along this rail to draw current, while the return current typically travels back through the running rails. The other options refer to related ideas—rail return is the return path through the rails, a third rail gap is the insulating space between sections, and a third rail warning device is safety equipment—but the rail itself, the one that carries the power, is called the third rail.