What action should be taken if a main track is fouled without authority?

When a main track is fouled without authority, the appropriate action is to establish protection according to rule 6.19. This rule outlines the necessary procedures to ensure the safety of personnel and equipment when an unauthorized foul of the main track occurs. By establishing protection, you create a safety barrier or implement procedures to prevent a collision or accident due to the presence of unauthorized individuals or equipment on the track.

This action is crucial because it prioritizes safety and helps prevent potential accidents while the situation is being resolved. Establishing protection typically involves notifying the appropriate personnel and may involve setting up warning signals or other defensive measures to ensure that trains do not enter the fouled area until it is safe to do so.

Other options may involve communication or documentation but do not directly address the immediate need to ensure safety in the event of a track foul. Promptly establishing protection effectively manages the risk and allows for a systematic approach to resolving the issue at hand.