What should a train operator avoid doing while the train is in motion for the sake of safety?

While the train is in motion, a train operator should avoid centering the reverser for safety reasons. The reverser controls the direction of the train, and making adjustments to it while the train is moving can lead to unintended directional changes or loss of control. This could potentially result in dangerous situations, such as derailment or collision if the train were to suddenly change direction without proper precautions in place.

Proper train operation requires all controls to be managed with the train at a complete stop and under controlled conditions to ensure safety for both the train crew and passengers. Keeping the reverser adjustments to moments when the train is stationary allows for more efficient and safer operations.

The other options, while they might have safety concerns in different contexts, would not directly put the train's operational safety at immediate risk in the same way. Adjusting speed limits, resetting trip settings, or monitoring the schedule can be done under controlled circumstances without compromising the train's safety.