Where should blue flags/lights be displayed if the equipment is on a non-main track?

The correct choice regarding the display of blue flags or lights when equipment is on a non-main track is that they should be positioned on the control stand or console of the controlling engine. This practice is crucial for maintaining safety, as it clearly indicates to all crews that the equipment is being protected and that it is not safe for trains or equipment to proceed into the work area.

Displaying the blue flags or lights on the control stand or console ensures that the engineer or crew operating the controlling engine is aware of the equipment's status. This placement prevents any potential accidents by clearly communicating that the area is occupied and should be treated with caution. Furthermore, it is important that this signaling method aligns with the specific requirements of the NORAC rules, focused on safety during operations involving non-main track scenarios.

In contrast, while placing flags at each end of the equipment may seem logical in a general context, it does not provide the same immediate visibility and awareness for the crew operating the locomotive, especially in busy or complex operating environments. The other choices entail locations or methods that would not be effective in ensuring clear communication regarding the protected status of the equipment on non-main tracks.