How do whistle signals indicate train approach?

Whistle signals are a critical communication tool used to enhance safety in environments where trains operate. Standard cues, such as whistle signals, are specifically designed to alert workers about an approaching or moving train. When a train engineer uses these whistles, they send a series of defined sound signals that have predictable meanings understood by workers on or around the tracks.

These signals provide immediate warnings, allowing workers to take appropriate action to ensure their safety, such as moving to a safe location away from the tracks. This method serves as a key component of the roadway worker protection program, assisting in preventing accidents and ensuring that all personnel are aware of the train’s movements.