What should be done if an imperfectly displayed signal is encountered?

When encountering an imperfectly displayed signal, the correct action is to regard it as the most restrictive indication. This approach is based on safety protocols that prioritize caution in situations where signals are not clearly conveying their intended meaning. By treating the imperfect signal as the most restrictive, a train crew minimizes the risk of proceeding into potentially hazardous conditions that could arise from misinterpreting the signal’s actual status.

This practice ensures that the train operates under the assumption that the signal is indicating the need for the most cautious approach, effectively safeguarding against possible accidents or mishaps. It emphasizes the importance of being conservative in interpreting signals in order to maintain the highest level of safety during operations.

Other options suggest varying levels of caution or misinterpretation, such as proceeding without stopping or assuming a clear signal, which could lead to unsafe scenarios. Therefore, the guidance to treat the signal as most restrictive serves as a vital rule in train operations to ensure the safety of the train and its crew.