When must a locomotive engineer check fuel levels?

A locomotive engineer must check fuel levels whenever directed by any company supervisor because this process ensures that the locomotive is properly fueled and ready for operation according to company standards. Supervisors are trained individuals who understand operational requirements and constraints, including safety and efficiency considerations. Their directive helps maintain compliance with regulations and operation procedures, ensuring that the locomotive is adequately prepared for its assigned tasks.

Checking fuel levels on command, rather than on a set schedule or condition, ensures responsiveness to changing operational demands and prevents unexpected delays or operational issues that could arise from insufficient fuel. This practice aligns with the need for a proactive approach to management and maintenance of equipment, ensuring that the crew can operate the train safely and effectively.