Which statement best describes the purpose of a block within NORAC 100?

• A. A signposted speed limit determines your speed within the block.
• B. The conductor's verbal instruction only.
• C. The track switch position alone.
• D. Track blocks and signals control train movements within the block.

Answer: (D)

In NORAC 100, a block is a defined section of track whose movements are controlled by signals and occupancy information. The purpose is to provide a safe, predictable way to move trains by clearly indicating when it is safe to enter or proceed through that section and by enforcing separation between trains. That’s why the statement that track blocks and signals control train movements within the block is the most accurate description. Speed limits, verbal instructions, or a switch position alone do not establish safe control of movement; the block signals and the occupancy status govern what you can do inside the block.