If a Track Authority in Non-CTC territory begins or ends at a CTC control point, what will be shown on the track authority at the CTC control point?

• A. SW-N
• B. SW-Y
• C. A notation marking the point
• D. Not shown at the CTC control point

Answer: (A)

When a Track Authority crosses from non-CTC territory into or out of a CTC control point, the boundary switch status must be communicated so trains know how the line is aligned at that point. The best choice shows a switch designation with Normal position, written as SW-N. This tells the crew and dispatchers that the turnout at the boundary is set to the normal position (the main route), which is the safe and standard condition for handoffs between control areas. The other options don’t align with how the boundary switch is conveyed: a simple notation marking the point doesn’t specify the switch state; not showing anything omits critical boundary information; and SW-Y would imply a non-normal switch setting at the boundary, which isn’t the standard to indicate for this scenario.