When is it permissible to display yellow flags less than two miles in advance of a restricted area?

Displaying yellow flags less than two miles in advance of a restricted area is permissible when the restricted area is located on a siding or is close to junctions. This situation acknowledges that when a restricted area is in proximity to critical operational points, such as sidings or junctions, there may be a need for more immediate warning to crews than the usual two-mile advance notice.

In such instances, ensuring that crew members are promptly alerted enables them to prepare for any necessary actions, thereby maintaining safety and operational efficiency. The regulations provide flexibility to adapt to the unique circumstances of the track layout, which is essential for maintaining safe operations in complex areas.

For other scenarios, such as during night operations or specific crew authorization, the standard procedures typically remain in effect, emphasizing the established guidelines around signaling and the importance of maintaining uniform operational protocols across various situations.