What is required when a train is operating in ABS territory and has passed a distant signal?

When a train is operating in Automatic Block Signal (ABS) territory and has passed a distant signal, it is required to prepare to stop at the next signal. This requirement exists because a distant signal indicates the condition of the next block, and it may not always provide a clear indication to proceed without any caution. By preparing to stop, the crew ensures that they are ready to respond appropriately based on the indication given by the next signal, which is critical for maintaining safety and preventing potential collisions.

In ABS territory, signals are typically used to communicate whether the track ahead is clear or if a stop is necessary. Therefore, passing a distant signal should instill caution in the train crew, prompting them to be prepared to stop at the next signal, ensuring they adhere to the established operational protocol and contribute to safe railway operations.

The other options do not align with the safety protocols associated with signal indications in ABS territory. The requirement to signal to the Dispatcher, exceed speed restrictions, or proceed without stopping are not consistent with the operational rules designed to maintain safe train movements in response to signal indications.