What should a crew do if they encounter an absent or imperfectly displayed fixed signal?

When a crew encounters an absent or imperfectly displayed fixed signal, they must apply the provisions of Rule 242. Rule 242 is specifically designed to address situations where a signal is not clearly indicating the intended indication for train movement. This rule provides guidance on how to proceed safely and appropriately when signals fail or are unclear.

Following Rule 242 ensures that the crew takes the necessary precautions to assess the situation and determine the safest course of action for train operations. It typically involves stopping the train to ascertain the issue further, communicating with appropriate personnel, and possibly proceeding under restricted conditions if certain criteria are met. Understanding and applying this rule is vital for maintaining safety in train operations.

Engaging with options like stopping all movements immediately or proceeding at high speed would not provide the structured approach needed in this context. Utilizing the radio to contact the Dispatcher may also be a helpful action, but it is secondary to adhering to Rule 242, which outlines the immediate necessary steps in response to signal irregularities.