Which pieces of information must be copied into the remarks section when receiving form EC-1/EC-1e line authority?

The correct answer emphasizes the importance of critical operational details that are essential for safe and effective train movement. When receiving form EC-1/EC-1e line authority, copying the locomotive number, train number, direction of travel, and location into the remarks section provides essential information that ensures clear communication among crew members and relevant personnel.

This information is vital for various reasons. The locomotive number helps identify the specific engine in operation, while the train number largely links to a specific scheduled service. The direction of travel offers clarity on the intended route, and the location pinpoints where the train is currently or expected to be, which is crucial for maintaining safe distances between trains and for signaling operations.

In contrast, the other choices consist of information that, while possibly relevant in different contexts, does not directly pertain to the immediacy of ensuring safety and operational integrity when line authority is granted. Weather conditions, crew names, estimated time of arrival, and specific track conditions all provide useful data in broader operational scenarios but are not the priority pieces of information that directly relate to the line authority process.