What does an Approach sign signify?

An Approach sign indicates a caution to prepare to stop. This sign is used in train operations to alert the engineer that they are approaching a signal that may require them to halt the train. It serves as an important warning that prompts the engineer to reduce speed and be ready to respond to the upcoming signal, which could mean stopping before the next section of track. Proper interpretation of this sign is critical for maintaining safety and ensuring that the train operates smoothly within the railway system.