If the cab signal portion of wayside signaling equipment is inoperative, what must the Dispatcher do?

When the cab signal portion of the wayside signaling equipment is inoperative, the Dispatcher must verbally inform the limits of the affected area. This action is critical because it ensures that train crews are made aware of the specific areas where the signaling system is not functioning, allowing them to operate with heightened caution. Clear communication of these limits is essential for maintaining safety and preventing potential accidents that could arise from unclear signals.

Notifying the crew about the affected area enables them to adjust their operations accordingly, as they may need to rely more on other safety protocols or visual signals in those zones. This direct communication of the operational limits helps to ensure that all personnel are on the same page regarding the status of the signaling system and can take appropriate actions.

In contrast, issuing a travel advisory or calling for repairs may be actions that could follow, but they do not immediately address the critical need for clear communication about the inoperative areas. Acknowledging the error in logs is important for record-keeping but does not directly assist in ensuring safe operations in the moment. Thus, verbally informing the crew about the boundaries of the affected area is the crucial first step to maintaining safety under these circumstances.