Which light motion is used to move a train toward the signal source?

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

Answer: (B)

Moving toward the signal source is conveyed by a light pattern that is highly distinctive and easy to recognize at a distance. Swinging the lantern in a circle creates a continuous, eye-catching motion that clearly signals the train to approach the signal, directing attention toward the source and indicating the instruction to come closer for the next instruction. This circular motion stands out from other patterns and is reliably interpreted as a directive to move toward the signal. The horizontal or vertical waves are less unambiguous for this purpose and are more likely to be used for other signals or status cues, while rapid flashing tends to serve as a warning or attention grab, not a directional instruction.