What action should an operator take upon a YELLOW OVER RED (IRT) signal?

When an operator encounters a YELLOW OVER RED (IRT) signal, it indicates that the next signal will be RED. This is a cautionary signal that requires the operator to reduce speed and proceed with care, as stopping may be necessary at the next signal if it turns RED.

The presence of the YELLOW aspect serves as a warning, meaning that the operator should be prepared for a stop, and thus, maintaining caution is paramount to ensure safety. Adhering to this signal is crucial for managing the flow of train operations and preventing potential accidents caused by a sudden change to a RED signal without warning.

Following this precaution allows operators to be alert to potential hazards ahead and provides enough time to make necessary adjustments, ensuring the safety of all passengers and crew on board.