What does "having the train under full control" mean for a train operator?

"Having the train under full control" refers to the operator's responsibility for ensuring the train can be stopped smoothly within their range of vision. This means that the operator must be aware of their surroundings and any potential hazards on the track, allowing them to react appropriately, such as stopping the train as needed for obstacles, signals, or passenger safety.

In this context, having control is tied to the operator's ability to manage the train's speed and respond to situational changes effectively. By maintaining a stop distance that corresponds to what they can see, operators can ensure a safe environment for both passengers and the train crew. This principle is critical in train operations, as it prioritizes safety above other factors such as speed or comfort.

The other options do not align with the concept of full control as they either focus on inappropriate speed management or ignore the need for responsiveness to changing conditions. Thus, the correct understanding of maintaining control emphasizes safety and situational awareness rather than speed for other reasons.