When signaling with light to move the train toward the signal source, which light motion should be used?

• A. Wave light horizontally
• B. Swing light to circular motion
• C. Wave light in vertical direction
• D. Move the light diagonally

Answer: (B)

Communicating the command to move toward the signal source relies on a motion pattern that clearly signals approach. Swinging the light in a circular motion is the best way because a circular sweep is distinct and easily interpreted as inviting the train to close in on the source. In mine signaling, this continuous, rounded motion stands out in low-visibility conditions and conveys a clear intention to move toward the light, reducing ambiguity.

Other movements—such as a horizontal wave, vertical motion, or diagonal shifts—can be mistaken for different instructions or directions, or may not be as quickly recognizable as an instruction to approach. The circular motion therefore provides the most unambiguous, recognizable cue that the train should advance toward the signal.