What should be done when the engine is about to move?

When the engine is about to move, activating the engine bell is crucial as it serves as a warning to anyone in the vicinity that the locomotive is about to begin movement. This action not only alerts passengers and crew but also helps to prevent accidents by signaling that the train is ready to depart or move. The sound of the bell can be heard from a distance, enabling others to take necessary precautions and clear the area.

While ensuring the area is clear and signaling readiness, confirming with crew members, and proceeding with caution are all important considerations, the primary and immediate action focused on the operation of the engine is to ring the bell. This step is specifically intended to announce the engine's impending movement, which is a foundational safety measure in railway operations.