Which sign typically indicates working limits?

Answer: B — Working Limits Stop Sign

The correct answer is the Working Limits Stop Sign, which is specifically designed to indicate that train movement within certain limits is restricted, ensuring safety for workers on the tracks. This sign is crucial for communicating to train crews that they must stop and comply with the defined working limits to protect both personnel and infrastructure during maintenance or construction activities. The Working Limits Stop Sign provides clear visual guidance that alerts train operators to be cautious and observant, preventing potential accidents or conflicts with ongoing work. It sets a clear parameter for where work is taking place, allowing for organized and safe operations. In contrast, the other options, while they are related to signaling in rail operations, do not specifically denote working limits in the same direct way as the Working Limits Stop Sign.