What is the initial action to take if a cab signal fails while en route?

When a cab signal fails while a train is en route, the initial action of notifying the Dispatcher immediately is essential for safety and communication. This action is crucial because the Dispatcher can provide guidance on how to proceed in light of the failure, which may include instructions on regulating speed, finding a safe stopping point, or coordinating with other trains in the area.

Promptly communicating the failure allows the Dispatcher to assess the situation and determine if additional safety measures or personnel are needed. This response ensures that the train can continue operating safely, even with a malfunctioning signal.

Proceeding at normal speed without notifying the Dispatcher poses significant risks since the driver may not be aware of the implications of the signal failure, which could lead to safety hazards. Similarly, starting to reverse immediately or waiting for further instructions without first informing the Dispatcher could lead to dangerous situations or operational confusion. Thus, notifying the Dispatcher is the fundamental first step when dealing with a cab signal failure.