What is indicated by a red flashing light on the A-end Local exterior indicator of a C-3 car?

A red flashing light on the A-end Local exterior indicator of a C-3 car signifies that the hand brake is applied. This indicator is crucial for providing visual confirmation to the crew and other personnel that the hand brake is engaged, which is essential for safety during various operational scenarios, such as when the train is stationary. When the hand brake is applied, it helps to prevent unintended movement of the car, particularly in situations where the train is parked on a grade or when maintenance is being performed.

Understanding this signal is vital for maintaining the integrity of train operations, as an engaged hand brake would signal caution and the need for careful handling of the car. This information allows crew members to assess whether they can safely proceed with other tasks or if additional precautions need to be taken.