Which of the following actions is prohibited on "on hold" tracks?

The prohibition of movements or maintenance that disturb the track or catenary on "on hold" tracks is based on safety protocols designed to protect both personnel and equipment. When tracks are designated as "on hold," it indicates that they are not to be used for any operations, including activities that could impact the integrity of the track or associated catenary systems.

This measure helps prevent potential hazards and accidents that could arise from any alterations or disruptions to the track during a period when it is not actively in use. The designation signifies that these tracks are under special scrutiny or monitoring, meaning that operations that could lead to additional wear, structural changes, or operational risk are not permitted.

In contrast to this, activities like inspections or assessments are generally allowable to ensure track integrity and safety, while minor repairs may not compromise the track's status significantly. Coordination with RWIC for maintenance can also take place without endangering the safety protocols in place for "on hold" tracks, as it typically serves to facilitate communications about ongoing safety measures and maintenance schedules.