What must be done with any articles or packages left on the train?

The correct choice emphasizes the importance of proper protocol when dealing with items left on trains. Articles or packages found unattended are considered lost property and must be turned in to the appropriate authorities. This procedure typically involves tagging the items for identification so that they can be returned to their rightful owners. This process ensures accountability and helps maintain a safe and organized environment within the transportation system.

In many situations, keeping lost items or disposing of them without following established protocols could lead to potential legal issues or violations of company policies. It's critical for employees to adhere strictly to the guidelines to protect both passengers and the organization.