What should a crew member do if a safety device becomes defective en route?

Answer: B — Inform the train dispatcher and mechanical department

When a safety device becomes defective while en route, it’s crucial to prioritize safety and proper protocol. Informing the train dispatcher and mechanical department is the appropriate action because they are responsible for assessing the situation and providing guidance on how to proceed. This communication ensures that qualified personnel can evaluate the safety implications of the defect and decide on the best course of action, which can include arranging for repairs or necessary safety checks. Engaging the dispatcher and mechanical team also allows for proper documentation of the incident and ensures compliance with regulations, which are essential for maintaining operational safety. The dispatcher may also know the planned route and any potential risks associated with continuing operations without the safety device functioning properly. Thus, this approach not only protects the crew but also upholds the safety of passengers and cargo during transit.