What does a Red MIL with angled white lights all illuminated mean?

When a Red MIL (Movement Indicator Light) displays angled white lights that are all illuminated, it signifies that the points are set for the turnout. This indication is crucial for train operations as it informs the driver that the track ahead is aligned properly for the train to proceed onto the designated route.

Understanding the function of these lights is key. In the context of safeworking, ensuring that trains navigate correctly through turnouts is vital for maintaining safety and efficiency. When the points are set for the turnout, the illuminated angled white lights alert the train operator that they can traverse the angle without fear of misalignment, ensuring a smoother transition between tracks and reducing the risk of derailment or other operational issues.

The other options pertain to scenarios that do not directly reflect the specific indications given by the Red MIL with all white lights illuminated. Thus, recognizing the meaning of these signal indications is a fundamental aspect of maintaining safety in rail operations.