If an engineer is notified about a K-card annulment, what must they do?

When an engineer is notified about a K-card annulment, it is essential for them to perform a Safe Stop. A K-card annulment indicates that a previous train order or signal has been canceled, which may affect the train's operations. Performing a Safe Stop ensures that the engineer can evaluate the situation, ensure safety protocols are followed, and determine the necessary actions to take in response to the annulment.

This protocol emphasizes the importance of safety and communication within train operations. It allows the engineer to assess whether to proceed, check for any updated information or instructions, and ensure that all safety guidelines are adhered to before continuing travel. Taking this precautionary step protects not only the train crew and passengers but also the integrity of the rail system as a whole.