If a door is not closing properly, which should be the operator's course of action?

In the scenario where a door is not closing properly, the most appropriate course of action is to call the Control Center and take the train out of service. This action is crucial for several reasons.

First and foremost, safety is the top priority in train operations. A malfunctioning door could compromise the safety of passengers and crew, especially if the train is in motion or ready to depart. If the door can't close properly, it poses a significant risk of passengers falling out or the door opening during travel, which could lead to serious accidents.

Taking the train out of service ensures that proper maintenance can be conducted without putting anyone at risk. By notifying the Control Center, you are following protocol, allowing for the situation to be assessed appropriately, and ensuring that the train doesn't operate under potentially hazardous conditions.

This response aligns with operational best practices that prioritize safety and compliance with regulations. Other options do not adequately address the immediate safety concerns, as attempting to fix the issue on the spot may not be feasible or safe, while reporting it after the trip would leave passengers at risk in the meantime. Ignoring the problem, especially while passengers are boarding, would be irresponsible and against safety protocols.