What flag will be displayed before a temporary speed restriction on a track bulletin Form A?

The display of a yellow flag before a temporary speed restriction on a track bulletin Form A is an important safety measure to alert train crews about the change in operational conditions. The yellow flag serves as a visual cue that indicates the need for a reduction in speed, allowing train crews to prepare for the upcoming restriction. This is crucial for maintaining safety on the tracks, as it gives conductors and engineers the necessary warning to adjust their speed accordingly.

In railroad operations, flags are employed to communicate specific messages clearly and effectively. The yellow flag specifically signals caution and indicates that something requires attention. In contrast, other colors such as red are typically used to indicate a complete stop or danger, while green typically signals that everything is clear and safe. Blue flags are associated with maintenance or work being performed on a train or track. Understanding the meanings of these flags is essential for the safe operation of trains, ensuring that crews can respond appropriately to varying track conditions.