Before moving a hazardous material shipment in a train, what must a crew member ensure they have?

Answer: B — Train List or document showing current positions of hazardous material shipments

Having a Train List or document that shows the current positions of hazardous material shipments is critical before moving a train carrying such materials. This document provides vital information regarding the exact location and type of hazardous materials on board, which is essential for ensuring safe transportation. Knowing the specifics helps crew members to adhere to safety protocols and manage potential risks associated with hazardous materials, should an emergency arise. This document serves as a key reference that enables the crew to respond effectively if an incident occurs and is crucial for compliance with federal regulations governing the transport of hazardous materials. It ensures that all necessary precautions are taken based on the contents of the train, especially in the event of an accident, where knowing the specific hazards can be life-saving.