Why is it improper for conductors to close train doors without observing passengers?

Closing train doors without observing passengers is critical because it ensures the safety of all individuals boarding and alighting the train. If a conductor closes the doors without being aware of the presence of passengers, there is a significant risk that someone could be in the doorway, leading to a dangerous situation where a passenger could be struck by the closing door. This action prioritizes passenger safety, which is paramount in train operations.

While other factors such as delays to operations and schedule disruptions may seem relevant, they pale in comparison to the important responsibility of ensuring that every passenger is safely clear of the doors before they close. A malfunction with the doors can also be a concern, but the primary reason for this observation practice is the direct safety of passengers.