What must be done if the clearance between uncoupled locomotives or cars is less than 50 feet?

When the clearance between uncoupled locomotives or cars is less than 50 feet, safety becomes the primary concern. Not attempting to go between these vehicles is essential to avoid the risk of injury or accidents. A clearance of less than 50 feet indicates a potentially dangerous situation where the risk of getting caught or injured is significantly higher due to the proximity of the rail cars or locomotives.

This guideline is crucial in maintaining safety practices within railroad operations. It ensures that crew members do not put themselves in harm's way, as the narrow clearance could lead to accidents if not handled with caution. Proper protocols dictate that when such situations arise, crew members should take alternative actions rather than attempting to navigate through a dangerous space.

The other options involve actions that do not directly address the immediate safety hazard posed by the reduced clearance. Depending on calling for additional crew members or checking engine conditions may not be suitable responses without first ensuring a safe environment. Choosing the fastest path could further complicate matters and increase risk, thus underscoring the importance of safety protocols in railroad operations.