UPPSC Civil Engg. A.E. 2004 (I)
⭕ A. Semaphore arm is lowered but Warmer arm is horizontal
⭕ B. Both semaphore and Warmer signals are lowered
⭕ C. Both the arms are horizontal
⭕ D. None of the above
📚 Explanation:
When semaphore and Warner signals are installed on the same post, the stop indication is shown when both arms are in the horizontal position.
🔹 Horizontal arm = STOP in railway signaling.
🔹 Lowering of arms corresponds to caution or proceed, depending on type.
Why is this done?
The Warner signal only warns, while the semaphore controls movement. When both arms are horizontal, it clearly communicates a complete stop to the driver.
When semaphore and Warner signals are installed on the same post, the stop indication is shown when both arms are in the horizontal position.
🔹 Horizontal arm = STOP in railway signaling.
🔹 Lowering of arms corresponds to caution or proceed, depending on type.
Why is this done?
The Warner signal only warns, while the semaphore controls movement. When both arms are horizontal, it clearly communicates a complete stop to the driver.
👉 Therefore, the correct answer is: C. Both the arms are horizontal
Key Points on Semaphore & Warner Signals:
- Horizontal arm = STOP for both semaphore and Warner signals.
- Combined signals: Used to indicate distant + home signals on the same post.
- Lowered arm: Indicates proceed or caution depending on signal type.
