What code is added to a 3 block 4 territory to indicate the approach?

What code is added to a 3 block 4 territory to indicate the approach?

• A. Approach medium 120 code
• B. 75 code
• C. 120 code (track circuit)
• D. 60 code

Answer: (A)

In this signaling concept, codes added to a territory communicate not just occupancy but the status and speed that apply as you approach the next signal. The correct choice uses the approach code with a medium speed designation, paired with the specific code variant for that territory. This directly tells you that you’re in the approach to the next block and must proceed at a medium speed as you enter the territory. The other options either describe track-circuit status rather than the approach state, or specify a different speed, which wouldn’t accurately represent the approaching condition.

In this signaling concept, codes added to a territory communicate not just occupancy but the status and speed that apply as you approach the next signal. The correct choice uses the approach code with a medium speed designation, paired with the specific code variant for that territory. This directly tells you that you’re in the approach to the next block and must proceed at a medium speed as you enter the territory. The other options either describe track-circuit status rather than the approach state, or specify a different speed, which wouldn’t accurately represent the approaching condition.