What happens if the engineer does not acknowledge a more restrictive cab signal indication?

If the engineer does not acknowledge a more restrictive cab signal indication, a penalty brake application is initiated. This is a crucial safety feature designed to ensure the train operates within the limits set by the cab signal system. The system is in place to prevent potential accidents and enhance overall safety on the railway.

When a more restrictive signal is presented, it indicates to the engineer that a reduction in speed or a stop is necessary for safety reasons. If the engineer fails to respond appropriately—such as acknowledging the signal—the automatic safety systems take over. The penalty brake application serves as an immediate measure to slow down or stop the train, thereby preventing the risk of danger associated with ignoring the signal.

The focus on a penalty brake application emphasizes the importance of compliance with signal indications for the safety of both passengers and railway operations. It highlights that the cab signal system is designed to protect against human error by taking automatic action when compliance is not maintained.