During daylight hours on elevated lines, what does a caution signal indicate?

A caution signal during daylight hours on elevated lines is represented by a yellow flag. This signal is used to communicate to train operators that they should be prepared to reduce speed or take precautionary measures as they approach potential hazards or areas requiring special attention. The yellow flag serves as a visual alert that, while conditions may not be immediately dangerous, operators must remain vigilant and be ready to respond appropriately to any changing circumstances.

This signaling system is critical in ensuring the safety of train operations, particularly in areas with multiple trains or where work crew activities might be present. By using the yellow flag, the system effectively communicates important information to operators, helping to prevent accidents and maintain safe conditions on the elevated lines.