CGPSC AE 2017
⭕ A. 4 days
⭕ B. 1 week
⭕ C. 2 days
⭕ D. 3 days
⭕ E. 15 days
📚 Explanation:
Semaphore-type signals are one of the earliest forms of fixed railway signals.
🔹 They are used specifically when maintenance or repair work lasts more than 3 days.
🔹 For shorter durations, temporary hand signals or flags may be used instead.
Semaphore-type signals are one of the earliest forms of fixed railway signals.
🔹 They are used specifically when maintenance or repair work lasts more than 3 days.
🔹 For shorter durations, temporary hand signals or flags may be used instead.
👉 Therefore, the correct answer is: D. 3 days
Key Points on Semaphore Signals:
- Used duration: When maintenance/repair exceeds 3 days.
- Type: Early fixed railway signal form.
- Purpose: To control train movement safely during long-term work.
