A segment of track with definite boundaries upon which trains may move only as authorized by the roadway worker in charge of that segment of track.

• A. Working Limits
• B. Foul Time
• C. Inaccessible Track
• D. ACSES

Answer: (A)

The concept here is working limits. This term describes a defined segment of track where trains may move only with the explicit authorization of the roadway worker in charge of that segment. The RWIC holds authority to grant or deny movements within those boundaries and to enforce protection measures for workers inside the area. This creates a safe, controlled space where on-track personnel can work while trains are still aware of the limits and must receive clearance to enter or move within them. Other terms refer to different safety ideas: foul time is the protected period when a track is considered fouled by work and not available for traffic, inaccessible track means a track that is blocked or unavailable, and ACSES is a train-control system used for speed enforcement and protection but does not define a working boundary.