How should you proceed when approaching a color light signal showing only a white light?

When approaching a color light signal that is displaying a white light, it is important to treat the signal as a Restricting signal. A white light indicates that the train is not to exceed a specific speed and is a caution to the engineer that there may be conditions ahead that require attention, such as track work, an obstruction ahead, or other operational restrictions.

Understanding the significance of the white light in this context is crucial for safety. The engineer should reduce speed and be prepared for any unexpected situations that may arise following the signal. Ignoring the signal or continuing at normal speed could lead to dangerous situations, as it may not provide clear information about the track conditions ahead. Similarly, proceeding with caution without recognizing the specific meaning of a white light could result in unnecessary risk. By treating it as a Restricting signal, proper protocol is followed, ensuring the safety of the train and its operations.