What is the function of blue flags or lamps in rail operations?

Blue flags or lamps serve as a critical safety measure in rail operations, specifically indicating that a track is being worked on. When a blue flag or lamp is displayed, it signals to all train crews and personnel that maintenance or repairs are in progress on that track. This alert helps prevent accidental movement of trains through that area, thereby ensuring the safety of workers on site.

The proper use of blue flags is essential for maintaining a secure working environment and protecting both personnel and equipment during maintenance activities. Knowing the significance of this signaling system is crucial for any train engineer, as it underscores the importance of vigilance and adherence to safety protocols in rail operations.