What is the purpose of a blue light at night in rail operations?

The blue light in rail operations serves a critical purpose in indicating that work is ongoing in a specific area. When railroad maintenance workers or other personnel are performing tasks near the tracks, it is essential to alert train operators and other personnel of this activity to ensure safety. The use of blue lights acts as a visual warning that there are ongoing operations that may require the attention or caution of those passing through the area.

In the context of rail safety, clearly marking work zones helps prevent accidents and ensures that both train operators and workers can carry out their duties while minimizing risks. The blue light is a standardized signal that distinguishes work zones from other track areas, making it an effective tool for communication within the rail system.