What is the purpose of third rail power in train operation?

The primary purpose of third rail power in train operation is to supply electrical energy to the trains for propulsion. Trains equipped with third rail systems draw power directly from the rail, allowing them to operate efficiently. This means that the third rail is crucial for providing the necessary electricity to drive the train's traction motors, which is essential for movement.

While fluorescent lighting in train cars may rely on electrical power, the direct role of the third rail is not to power the lighting specifically; instead, it's focused on the propulsion of the train itself. Other systems, like signaling, auxiliary systems, or battery charging, operate under different arrangements and sources of power. Thus, while train lighting may utilize power from the main system fed by the third rail, it does not represent the rail's primary function in train operation.