In a Track Authority in CTC Territory that includes SW-N at the entrance, what further authority is required to enter the limits?

• A. Verbal authority from the control operator to enter the limits
• B. No further authority
• C. Written permission
• D. A flag signal

Answer: (A)

The key idea is that in CTC territory, Track Authority protects a block, but entering the limits from an entrance that has a turnout requires explicit authorization from the control operator. Even if the switch at the entrance is set to Normal (SW-N), this does not by itself authorize you to move onto the limits. The dispatcher must give you verbal clearance to enter to confirm that the route is clear, that the switch is set for your entry, and that there are no conflicting movements planned. This verbal permission ensures proper protection and coordination before you proceed.

No further authority isn’t sufficient because the entry into protected limits still requires explicit permission. Written permission isn’t typically the clearance mechanism in this context, and a flag signal would not alone grant entry authorization in the same way a verbal clearance from the control operator does.