How should extra trains be prepared to stop while operating within yard limits?

When operating extra trains within yard limits, the correct practice is to prepare to stop within one-half the range of vision. This guideline is crucial because it ensures the crew has adequate time to react to any potential hazards, unexpected obstacles, or other trains that may be encountered in a yard area, which can often be congested and unpredictable.

Stopping within one-half the range of vision allows the engineer to maintain train control and ensure safety, as visibility can be limited due to various factors such as curves, buildings, or other rail yard activities. This preparation is vital for maintaining safe operations in areas where there might not be clear signals or defined stopping points.

Other options do not provide the same level of safety or responsiveness required in yard limits. For example, stopping at a scheduled stop or visible signal may not account for unexpected conditions that could arise at any point along the route.