What must crew members do before going between or working on the end of rail equipment?

The correct choice emphasizes the importance of crew communication and understanding before engaging in work on or near rail equipment. Ensuring that all crew members are aware of the tasks ahead helps to promote safety and coordination. When crew members have a clear understanding of their roles and the work to be performed, it minimizes the risk of accidents and miscommunication, fostering a safer working environment.

A collaborative approach is essential in rail operations due to the inherent hazards involved. By confirming that everyone is on the same page, crew members can coordinate effectively, which is critical in a potentially dangerous setting like rail operations. This preparation also allows for any questions or concerns to be addressed, further enhancing safety protocols.

While other options, such as signaling the engineer, giving stop signals, and wearing protective gear, may be important safety practices in various scenarios, the primary focus of the question is about ensuring collective understanding among crew members before commencing work. This foundational step of communication significantly contributes to the overall safety and efficiency of rail operations.