What should you do if the throttle is already positioned in RUN 4 at a grade crossing?

In the situation where the throttle is already positioned in RUN 4 at a grade crossing, waiting until the locomotive clears the crossing before advancing the throttle is the safest and most responsible choice. This approach ensures that the train maintains a level of control while crossing, allowing the operator to react appropriately to any potential hazards that may arise, such as pedestrians, vehicles, or obstructions on or near the tracks.

Maintaining control of speed and not advancing the throttle further ensures that the train can respond to braking as necessary. This cautious approach also aligns with safety protocols designed to protect both the train crew and the public at grade crossings, where the potential for accidents is higher. By waiting until the crossing is clear, the operator is prioritizing safety over speed, which is critical in train handling practices.

Increasing the throttle before clearing the crossing could lead to a loss of control or the inability to stop in time if an unexpected situation arises. Hence, this reinforces why the decision to wait is more aligned with prudent operational practices in train handling.