What must the Dispatcher communicate when a train reports a cab signal apparatus failure?

When a train reports a cab signal apparatus failure, it is crucial for the Dispatcher to communicate essential information, particularly regarding the train's interaction with the broader railway system. Informing the connecting dispatching district, division, or railroad for the train ensures that all relevant parties are aware of the situation and can take appropriate measures. This communication is vital for operational safety as it helps coordinate the response to the failure, including rerouting or stopping other trains that may be affected by the malfunction.

Providing this information also aids in managing traffic flow and maintaining safety protocols while the affected train is handled. Other aspects of the situation, like the condition of all trains in the area or instructions for the next stop, may also be important, but they do not directly address the immediate need for coordination with surrounding management entities. Similarly, details of previous signals encountered are less critical in managing the overall response to a cab signal failure since the focus should be on where and how this failure impacts the network. Thus, ensuring that the connecting dispatching district is informed allows for a comprehensive understanding of the train's situation within the larger operational context.