What does a "restricted signal" indicate?

A "restricted signal" is an important aspect of railway signaling that communicates specific instructions to train operators. This type of signal indicates that the train is authorized to proceed, but with certain limitations. The primary implication is that the train must operate at a reduced speed and be prepared for unexpected conditions ahead.

This reduced speed allows the operator to react appropriately to any potential hazards or changes in the environment, such as track obstructions, adverse weather conditions, or other unforeseen circumstances that could pose a risk to safe operations. It emphasizes the necessity of vigilance and readiness to stop or slow down further if required.

To distinguish this from other possibilities, proceed without restrictions implies that the train can move at normal speed without concern for hazards, which is not the case with a restricted signal. Stopping immediately would be indicated by a more severe signal, not associated with a restricted signal. Additionally, "all clear for high-speed travel" does not align with the cautious nature that a restricted signal conveys, as that would indicate no restrictions are in place. Therefore, the interpretation of a restricted signal as an indication to proceed at reduced speed, while remaining alert, is the correct understanding.