Bolt-Lock Switch is described as?

• A. A hand-operated switch equipped with a pipe connected locking device that is designed to shunt the signal system before the switch points are operated.
• B. A signal that indicates track occupancy.
• C. A blue signal.
• D. A bulletin order.

Answer: (A)

Bolt-Lock switches are hand-operated switches that include a pipe-connected locking device. The locking mechanism is designed to shunt (bypass) the signaling system so the switch can be moved and secured before the points are operated. This captures the key idea: a manual switch with a physical lock that interacts with the signal system to ensure safe, controlled operation. It’s not a track-occupancy signal, not a blue signal, and not a bulletin order, which is why those options aren’t correct.