A Track Authority in CTC Territory includes the instruction Switch Yes (SW-Y) at the entrance point of the limits. What further authority do you require to enter the limits?

• A. No further authority, SW-Y is the authority
• B. Verbal authority from the control operator to enter the limits
• C. Written permission from the supervisor
• D. A flag signal at the entrance

Answer: (A)

In CTC territory, entry into the limits is governed by the Track Authority itself, including the physical switch setting at the entrance. When the track authority includes Switch Yes (SW-Y) at the entrance, that switch position confirms the route is aligned and authorized for movement into the limits. Because SW-Y is part of the authority, there is no need for any additional verbal, written, or flag permission—the movement is already cleared to proceed as long as you remain within the limits defined by the authority and the route remains set. If the switch were not indicated as Yes, you would not be authorized to enter, and you’d need further instruction.