What is an important consideration when linking distributed power units?

The correct answer emphasizes the need to verify the position of track switches when linking distributed power units. This is crucial because proper positioning of track switches ensures that the entire train can navigate tracks safely and effectively. Misaligned switches can lead to derailing or accidents, particularly when multiple locomotives are operating in different sections of a train. Ensuring switches are properly aligned reduces the risk of operational dangers and contributes to the overall safety of train movements.

Other aspects of train handling, such as evenly distributing weight and notifying all crew members, are indeed important considerations but do not directly pertain to the immediate and critical task of linking distributed power units. Similarly, powering only the lead locomotive may affect the train's performance but does not necessarily address the vital coordination needed at track junctions during this specific operation phase.