On a Track Authority outside CTC territory, SW-Y will be used to indicate:

• A. The Foul Zone of the switch is not included in the limits
• B. The Foul Zone of the switch is included in the limits
• C. The Foul Zone is not applicable to this movement
• D. The switch is out of service during movement

Answer: (B)

In a Track Authority outside CTC territory, a symbol like SW-Y is used to show whether the foul zone around a turnout is included in the authority’s limits. The foul zone is the area around a switch that must be clear and protected to prevent conflicts with movements using the switch. The Y in SW-Y means “Yes, included,” so the switch’s foul zone is within the movement’s authority. This inclusion ensures the switch area is protected and governed by the same authority, preventing unsafe simultaneous occupancies or movements in that critical region. If the foul zone were not included, the authority wouldn’t cover that space, which could lead to unsafe situations. The other options describe scenarios that don’t match what SW-Y conveys.