What must be done when adding to a trouble train with an electrical problem?

When adding to a trouble train that is experiencing an electrical problem, it is crucial to retrieve the electrical portion at the addition point. This action ensures that the specific faulty segment can be identified and isolated without affecting the entire system. Addressing the issue at its source allows for a more manageable approach to troubleshooting and repairs. By focusing on the section where the problem has been detected, crews can minimize disruption to the remaining operational systems and maintain overall safety during the process.

In contrast, disconnecting the entire circuit would lead to a more extensive disruption and may not specifically address the problem at hand. Reporting the issue to maintenance is a necessary step, but it does not directly address the immediate need for action. Continuing operations until the next station could exacerbate the electrical problem and compromise safety, making it an imprudent choice. Thus, retrieving the electrical section at the addition point is the most effective and safe method for addressing the situation.