What position should the independent brake valve handles be in on the trailing locomotives?

The independent brake valve handles on trailing locomotives should be in the release position. This ensures that the brakes on those locomotives do not apply unintentionally when they are not in use, facilitating smoother operation and handling of the train. When the independent brake is released, it allows for normal movement and coupling without interference from brake application, which is critical during various operations such as switching or during yard movements.

The correct handling of the independent brake valve is essential for train safety and efficiency. Keeping the handles in the release position minimizes the risk of unintended braking that could lead to operational delays or potential safety hazards. In contrast, other positions like set, locked, or emergency would either engage the brakes or create a situation where braking cannot be controlled adequately, which is not desirable for trailing units.