What does a steady yellow MIL mean in train order territory?

In train order territory, a steady yellow signal, also referred to as "MIL," serves as an important indicator to train operators. When the steady yellow signal is displayed, it specifically means that points are set for the mainline, but caution is advised. This indicates that while trains are permitted to proceed, they must do so with a heightened sense of awareness due to potential conditions that may require them to slow down or stop.

This cautionary approach is critical because it alerts the train crew to remain vigilant for any unexpected situations that could arise ahead, such as other trains on the track or obstructions that may necessitate a change in speed or further action. Understanding this signal ensures that train operators prioritize safety and adhere strictly to operational protocols while navigating through these territories.

The other options do not accurately describe the implications of a steady yellow signal and may lead to misunderstandings regarding safe train operations. For example, the idea that points are set for a turnout or that a go signal at full speed is suggested does not align with the safety emphasis inherent in the steady yellow indication.