What action must be taken if there is a need to pass a block limit?

When there is a need to pass a block limit, the appropriate action is to request authorization to pass. This is crucial as it ensures the safety and proper communication with the control center before proceeding past the designated limit.

Passing a block limit without proper authorization could lead to hazardous situations, such as entering a section of track where it may not be safe to do so, potentially endangering the train crew, passengers, and other trains on the line. This procedure is a vital part of rail operations, emphasizing safety and coordination within the transportation system.

The process of requesting authorization serves as a formal means to ensure that all necessary precautions are observed and that the train can proceed safely under the stipulated conditions. It reflects the established protocol that prioritizes communication and safety over action.