The Modified Emergency block is governed by which type of control?

• A. Automatic
• B. Manual
• C. Remote
• D. Interlocking

Answer: (B)

The situation tests who governs a Modified Emergency block. It is controlled manually, meaning an on-site operator directly manages the block using hand-operated signals or switches. This ensures a trained person can assess occupancy and safety conditions, make the final safety checks, and authorize movement only when it’s truly safe—crucial in abnormal or degraded signaling scenarios. Automatic control would rely on the system to manage signals without human judgment, remote control would shift authority to a central office, and interlocking is the safety mechanism that prevents conflicting movements rather than a control mode. So manual control best fits the Modified Emergency block.