Under which conditions can additional equipment enter the out-of-service limits?

Additional equipment can enter the out-of-service limits specifically after permission has been received from the Engineering In Charge (EIC). This requires clear communication and assurance that the entry is safe and appropriate as per the established protocols and safety measures.

The role of the EIC is crucial in ensuring the safety of operations in areas that are designated as out-of-service, which often indicates that there may be potential hazards. Consequently, their approval is necessary before any equipment can enter such limited zones, reinforcing the importance of hierarchical safety checks in railway operations.

While other considerations like being equipped with lights or safety assessments by the crew are important for general safety, the explicit authorization from the EIC is the definitive requirement for entering these restricted areas.