What is added to a 3 block 4 territory?

What is added to a 3 block 4 territory?

• A. Manoeuver signal 60 code
• B. Dark territory 30 code
• C. Entrance signal 180 code
• D. Approach medium 120 code

Answer: (D)

In signaling, extending a protected territory by adding another block requires communicating an approaching speed restriction to the train. When a 3-block territory becomes a 4-block territory, the appropriate update is to add the approach restriction that tells the crew to prepare for a slower, controlled entry toward the next signal. The code that does this is “Approach medium 120,” which specifically indicates an approach at medium speed. This ensures the train has enough distance to comply with the next signal or track condition. The other options describe different situations (yard maneuvers, dark territory with no signals, or entrance signal conditions) and are not the correct way to communicate the speed change for expanding the territory.

In signaling, extending a protected territory by adding another block requires communicating an approaching speed restriction to the train. When a 3-block territory becomes a 4-block territory, the appropriate update is to add the approach restriction that tells the crew to prepare for a slower, controlled entry toward the next signal. The code that does this is “Approach medium 120,” which specifically indicates an approach at medium speed. This ensures the train has enough distance to comply with the next signal or track condition. The other options describe different situations (yard maneuvers, dark territory with no signals, or entrance signal conditions) and are not the correct way to communicate the speed change for expanding the territory.